update readme

fast batch ops storage swapping was temporary removed

README.md

@@ -1097,13 +1097,16 @@ id :: integer? -> id...
 name :: id... -> string...
 
 pack :: integer, integer -> id
-unpack :: id -> integer, integer, integer
+unpack :: id -> integer, integer
 
 defer :: boolean
 commit :: boolean
 
 spawn :: <fragment, component>? -> entity
-clone :: entity -> <fragment, component>? -> entity
+multi_spawn :: integer, <fragment, component>? -> entity[]
+
+clone :: entity, <fragment, component>? -> entity
+multi_clone :: integer, entity, <fragment, component>? -> entity[]
 
 alive :: entity -> boolean
 alive_all :: entity... -> boolean
@@ -1163,7 +1166,10 @@ chunk_mt:components :: fragment... -> storage...
 builder :: builder
 
 builder_mt:spawn :: entity
+builder_mt:multi_spawn :: integer -> entity[]
+
 builder_mt:clone :: entity -> entity
+builder_mt:multi_clone :: integer, entity -> entity[]
 
 builder_mt:has :: fragment -> boolean
 builder_mt:has_all :: fragment... -> boolean
@@ -1216,7 +1222,12 @@ builder_mt:destruction_policy :: id -> builder
 
 ## vX.X.X
 
+- Nothing yet, stay tuned!
+
+## v1.2.0
+
 - Added the new [`evolved.name`](#evolvedname-1) function
+- Added the new [`evolved.multi_spawn`](#evolvedmulti_spawn) and [`evolved.multi_clone`](#evolvedmulti_clone) functions
 - Added the new [`evolved.INTERNAL`](#evolvedinternal) fragment trait
 
 ## v1.1.0
@@ -1338,19 +1349,38 @@ function evolved.commit() end
 
 ```lua
 ---@param components? table<evolved.fragment, evolved.component>
----@return evolved.entity
+---@return evolved.entity entity
 function evolved.spawn(components) end
 ```
 
+### `evolved.multi_spawn`
+
+```lua
+---@param entity_count integer
+---@param components? table<evolved.fragment, evolved.component>
+---@return evolved.entity[] entity_list
+function evolved.multi_spawn(entity_count, components) end
+```
+
 ### `evolved.clone`
 
 ```lua
 ---@param prefab evolved.entity
 ---@param components? table<evolved.fragment, evolved.component>
----@return evolved.entity
+---@return evolved.entity entity
 function evolved.clone(prefab, components) end
 ```
 
+### `evolved.multi_clone`
+
+```lua
+---@param entity_count integer
+---@param prefab evolved.entity
+---@param components? table<evolved.fragment, evolved.component>
+---@return evolved.entity[] entity_list
+function evolved.multi_clone(entity_count, prefab, components) end
+```
+
 ### `evolved.alive`
 
 ```lua
@@ -1646,18 +1676,35 @@ function evolved.builder() end
 #### `evolved.builder_mt:spawn`
 
 ```lua
----@return evolved.entity
+---@return evolved.entity entity
 function evolved.builder_mt:spawn() end
 ```
 
+#### `evolved.builder_mt:multi_spawn`
+
+```lua
+---@param entity_count integer
+---@return evolved.entity[] entity_list
+function evolved.builder_mt:multi_spawn(entity_count) end
+```
+
 #### `evolved.builder_mt:clone`
 
 ```lua
 ---@param prefab evolved.entity
----@return evolved.entity
+---@return evolved.entity entity
 function evolved.builder_mt:clone(prefab) end
 ```
 
+#### `evolved.builder_mt:multi_clone`
+
+```lua
+---@param entity_count integer
+---@param prefab evolved.entity
+---@return evolved.entity[] entity_list
+function evolved.builder_mt:multi_clone(entity_count, prefab) end
+```
+
 #### `evolved.builder_mt:has`
 
 ```lua

ROADMAP.md

@@ -5,13 +5,11 @@
 - Improve the performance of required fragments by caching first-level required chunks.
 - Improve the performance of builders that are used multiple times by caching hint chunks.
 - Queries can cache major chunks to avoid finding them every time.
-- Add multi-spawn to the builder to spawn multiple entities at once.
 - Add a function to shrink storages to free unused memory.
 - observers and events
 - add INDEX fragment trait
 - use compact prefix-tree for chunks
 - optional ffi component storages
-- add EXCLUSIVE fragment trait
 
 ## Thoughts
 

develop/all.lua

@@ -1,9 +1,14 @@
 require 'develop.samples.systems'
 
+require 'develop.testing.multi_spawn_tests'
 require 'develop.testing.name_tests'
 require 'develop.testing.requires_fragment_tests'
 require 'develop.testing.system_as_query_tests'
 
+require 'develop.benchmarks.multi_clone_bmarks'
+require 'develop.benchmarks.multi_spawn_bmarks'
+require 'develop.benchmarks.process_bmarks'
+
 require 'develop.untests'
 
 require 'develop.unbench'

develop/benchmarks/multi_clone_bmarks.lua

@@ -0,0 +1,59 @@
+local evo = require 'evolved'
+local basics = require 'develop.basics'
+
+evo.debug_mode(false)
+
+local N = 1000
+
+local F1, F2, F3, F4, F5 = evo.id(5)
+local Q1 = evo.builder():include(F1):spawn()
+
+print '----------------------------------------'
+
+basics.describe_bench(string.format('Multi Clone Benchmarks: Simple Clone | %d entities with 1 component', N),
+    function()
+        local clone = evo.clone
+
+        local prefab = evo.spawn { [F1] = true }
+
+        for _ = 1, N do
+            clone(prefab)
+        end
+
+        evo.batch_destroy(Q1)
+    end)
+
+basics.describe_bench(string.format('Multi Clone Benchmarks: Simple Clone | %d entities with 5 components', N),
+    function()
+        local clone = evo.clone
+
+        local prefab = evo.spawn { [F1] = true, [F2] = true, [F3] = true, [F4] = true, [F5] = true }
+
+        for _ = 1, N do
+            clone(prefab)
+        end
+
+        evo.batch_destroy(Q1)
+    end)
+
+basics.describe_bench(string.format('Multi Clone Benchmarks: Multi Clone | %d entities with 1 component', N),
+    function()
+        local multi_clone = evo.multi_clone
+
+        local prefab = evo.spawn { [F1] = true }
+
+        multi_clone(N, prefab)
+
+        evo.batch_destroy(Q1)
+    end)
+
+basics.describe_bench(string.format('Multi Clone Benchmarks: Multi Clone | %d entities with 5 components', N),
+    function()
+        local multi_clone = evo.multi_clone
+
+        local prefab = evo.spawn { [F1] = true, [F2] = true, [F3] = true, [F4] = true, [F5] = true }
+
+        multi_clone(N, prefab)
+
+        evo.batch_destroy(Q1)
+    end)

develop/benchmarks/multi_spawn_bmarks.lua

@@ -0,0 +1,59 @@
+local evo = require 'evolved'
+local basics = require 'develop.basics'
+
+evo.debug_mode(false)
+
+local N = 1000
+
+local F1, F2, F3, F4, F5 = evo.id(5)
+local Q1 = evo.builder():include(F1):spawn()
+
+print '----------------------------------------'
+
+basics.describe_bench(string.format('Multi Spawn Benchmarks: Simple Spawn | %d entities with 1 component', N),
+    function()
+        local spawn = evo.spawn
+
+        local components = { [F1] = true }
+
+        for _ = 1, N do
+            spawn(components)
+        end
+
+        evo.batch_destroy(Q1)
+    end)
+
+basics.describe_bench(string.format('Multi Spawn Benchmarks: Simple Spawn | %d entities with 5 components', N),
+    function()
+        local spawn = evo.spawn
+
+        local components = { [F1] = true, [F2] = true, [F3] = true, [F4] = true, [F5] = true }
+
+        for _ = 1, N do
+            spawn(components)
+        end
+
+        evo.batch_destroy(Q1)
+    end)
+
+basics.describe_bench(string.format('Multi Spawn Benchmarks: Multi Spawn | %d entities with 1 component', N),
+    function()
+        local multi_spawn = evo.multi_spawn
+
+        local components = { [F1] = true }
+
+        multi_spawn(N, components)
+
+        evo.batch_destroy(Q1)
+    end)
+
+basics.describe_bench(string.format('Multi Spawn Benchmarks: Multi Spawn | %d entities with 5 components', N),
+    function()
+        local multi_spawn = evo.multi_spawn
+
+        local components = { [F1] = true, [F2] = true, [F3] = true, [F4] = true, [F5] = true }
+
+        multi_spawn(N, components)
+
+        evo.batch_destroy(Q1)
+    end)

develop/benchmarks/process_bmarks.lua

@@ -0,0 +1,102 @@
+local evo = require 'evolved'
+local basics = require 'develop.basics'
+
+evo.debug_mode(false)
+
+local N = 10000
+
+print '----------------------------------------'
+
+basics.describe_bench(string.format('Process Benchmarks: Evolved AoS Processing | %d entities', N),
+    function(w)
+        evo.process(w)
+    end,
+
+    function()
+        local wf = evo.builder()
+            :set(evo.DESTRUCTION_POLICY, evo.DESTRUCTION_POLICY_DESTROY_ENTITY)
+            :spawn()
+
+        local pf = evo.builder():set(wf):spawn()
+        local vf = evo.builder():set(wf):spawn()
+
+        evo.multi_spawn(N, {
+            [wf] = true,
+            [pf] = { x = 0, y = 0, z = 0, w = 0 },
+            [vf] = { x = 0, y = 0, z = 0, w = 0 },
+        })
+
+        evo.builder()
+            :set(wf)
+            :set(evo.GROUP, wf)
+            :set(evo.QUERY, evo.builder():set(wf):include(pf, vf):spawn())
+            :set(evo.EXECUTE, function(chunk, _, entity_count)
+                local ps, vs = chunk:components(pf, vf)
+
+                for i = 1, entity_count do
+                    local p, s = ps[i], vs[i]
+                    p.x = p.x + s.x
+                    p.y = p.y + s.y
+                end
+            end)
+            :spawn()
+
+        return wf
+    end,
+
+    function(w)
+        evo.destroy(w)
+    end)
+
+basics.describe_bench(string.format('Process Benchmarks: Evolved SoA Processing | %d entities', N),
+    function(w)
+        evo.process(w)
+    end,
+
+    function()
+        local wf = evo.builder()
+            :set(evo.DESTRUCTION_POLICY, evo.DESTRUCTION_POLICY_DESTROY_ENTITY)
+            :spawn()
+
+        local pxf = evo.builder():set(wf):spawn()
+        local pyf = evo.builder():set(wf):spawn()
+        local pzf = evo.builder():set(wf):spawn()
+        local pwf = evo.builder():set(wf):spawn()
+        local vxf = evo.builder():set(wf):spawn()
+        local vyf = evo.builder():set(wf):spawn()
+        local vzf = evo.builder():set(wf):spawn()
+        local vwf = evo.builder():set(wf):spawn()
+
+        evo.multi_spawn(N, {
+            [wf] = true,
+            [pxf] = 0,
+            [pyf] = 0,
+            [pzf] = 0,
+            [pwf] = 0,
+            [vxf] = 0,
+            [vyf] = 0,
+            [vzf] = 0,
+            [vwf] = 0,
+        })
+
+        evo.builder()
+            :set(wf)
+            :set(evo.GROUP, wf)
+            :set(evo.QUERY, evo.builder():set(wf):include(pxf, pyf, vxf, vyf):spawn())
+            :set(evo.EXECUTE, function(chunk, _, entity_count)
+                local pxs, pys = chunk:components(pxf, pyf)
+                local vxs, vys = chunk:components(vxf, vyf)
+
+                for i = 1, entity_count do
+                    pxs[i] = pxs[i] + vxs[i]
+                    pys[i] = pys[i] + vys[i]
+                end
+            end)
+            :spawn()
+
+        return wf
+    end,
+
+    function(w)
+        evo.destroy(w)
+    end)

develop/testing/multi_spawn_tests.lua

@@ -0,0 +1,308 @@
+local evo = require 'evolved'
+
+do
+    local entity_list
+
+    do
+        entity_list = evo.multi_spawn(0)
+        assert(entity_list and #entity_list == 0)
+
+        entity_list = evo.multi_spawn(0, {})
+        assert(entity_list and #entity_list == 0)
+    end
+
+    do
+        entity_list = evo.multi_spawn(-1)
+        assert(entity_list and #entity_list == 0)
+
+        entity_list = evo.multi_spawn(-1, {})
+        assert(entity_list and #entity_list == 0)
+    end
+
+    do
+        entity_list = evo.builder():multi_spawn(0)
+        assert(entity_list and #entity_list == 0)
+    end
+
+    do
+        entity_list = evo.builder():multi_spawn(-1)
+        assert(entity_list and #entity_list == 0)
+    end
+end
+
+do
+    local entity_list
+
+    do
+        entity_list = evo.multi_spawn(1)
+        assert(entity_list and #entity_list == 1)
+        assert(entity_list[1] and evo.empty(entity_list[1]))
+        assert(not entity_list[2])
+
+        entity_list = evo.multi_spawn(1, {})
+        assert(entity_list and #entity_list == 1)
+        assert(entity_list[1] and evo.empty(entity_list[1]))
+        assert(not entity_list[2])
+    end
+
+    do
+        entity_list = evo.multi_spawn(2)
+        assert(entity_list and #entity_list == 2)
+        assert(entity_list[1] and evo.empty(entity_list[1]))
+        assert(entity_list[2] and evo.empty(entity_list[2]))
+        assert(not entity_list[3])
+
+        entity_list = evo.multi_spawn(2, {})
+        assert(entity_list and #entity_list == 2)
+        assert(entity_list[1] and evo.empty(entity_list[1]))
+        assert(entity_list[2] and evo.empty(entity_list[2]))
+        assert(not entity_list[3])
+    end
+
+    do
+        entity_list = evo.builder():multi_spawn(1)
+        assert(entity_list and #entity_list == 1)
+        assert(entity_list[1] and evo.empty(entity_list[1]))
+        assert(not entity_list[2])
+    end
+
+    do
+        entity_list = evo.builder():multi_spawn(2)
+        assert(entity_list and #entity_list == 2)
+        assert(entity_list[1] and evo.empty(entity_list[1]))
+        assert(entity_list[2] and evo.empty(entity_list[2]))
+        assert(not entity_list[3])
+    end
+end
+
+do
+    local entity_list
+
+    local prefab = evo.id()
+
+    do
+        entity_list = evo.multi_clone(0, prefab)
+        assert(entity_list and #entity_list == 0)
+
+        entity_list = evo.multi_clone(0, prefab, {})
+        assert(entity_list and #entity_list == 0)
+    end
+
+    do
+        entity_list = evo.multi_clone(-1, prefab)
+        assert(entity_list and #entity_list == 0)
+
+        entity_list = evo.multi_clone(-1, prefab, {})
+        assert(entity_list and #entity_list == 0)
+    end
+
+    do
+        entity_list = evo.builder():multi_clone(0, prefab)
+        assert(entity_list and #entity_list == 0)
+    end
+
+    do
+        entity_list = evo.builder():multi_clone(-1, prefab)
+        assert(entity_list and #entity_list == 0)
+    end
+end
+
+do
+    local entity_list
+
+    local prefab = evo.id()
+
+    do
+        entity_list = evo.multi_clone(1, prefab)
+        assert(entity_list and #entity_list == 1)
+        assert(entity_list[1] and evo.empty(entity_list[1]))
+        assert(not entity_list[2])
+
+        entity_list = evo.multi_clone(1, prefab, {})
+        assert(entity_list and #entity_list == 1)
+        assert(entity_list[1] and evo.empty(entity_list[1]))
+        assert(not entity_list[2])
+    end
+
+    do
+        entity_list = evo.multi_clone(2, prefab)
+        assert(entity_list and #entity_list == 2)
+        assert(entity_list[1] and evo.empty(entity_list[1]))
+        assert(entity_list[2] and evo.empty(entity_list[2]))
+        assert(not entity_list[3])
+
+        entity_list = evo.multi_clone(2, prefab, {})
+        assert(entity_list and #entity_list == 2)
+        assert(entity_list[1] and evo.empty(entity_list[1]))
+        assert(entity_list[2] and evo.empty(entity_list[2]))
+        assert(not entity_list[3])
+    end
+
+    do
+        entity_list = evo.builder():multi_clone(1, prefab)
+        assert(entity_list and #entity_list == 1)
+        assert(entity_list[1] and evo.empty(entity_list[1]))
+        assert(not entity_list[2])
+    end
+
+    do
+        entity_list = evo.builder():multi_clone(2, prefab)
+        assert(entity_list and #entity_list == 2)
+        assert(entity_list[1] and evo.empty(entity_list[1]))
+        assert(entity_list[2] and evo.empty(entity_list[2]))
+        assert(not entity_list[3])
+    end
+end
+
+do
+    local f1, f2 = evo.id(2)
+
+    do
+        local entity_list
+
+        entity_list = evo.multi_spawn(2, { [f1] = true, [f2] = 123 })
+        assert(entity_list and #entity_list == 2)
+        assert(entity_list[1] and evo.get(entity_list[1], f1) == true and evo.get(entity_list[1], f2) == 123)
+        assert(entity_list[2] and evo.get(entity_list[2], f1) == true and evo.get(entity_list[2], f2) == 123)
+
+        entity_list = evo.multi_spawn(2, { [f1] = false, [f2] = 456 })
+        assert(entity_list and #entity_list == 2)
+        assert(entity_list[1] and evo.get(entity_list[1], f1) == false and evo.get(entity_list[1], f2) == 456)
+        assert(entity_list[2] and evo.get(entity_list[2], f1) == false and evo.get(entity_list[2], f2) == 456)
+    end
+
+    do
+        local prefab = evo.builder():set(f1, true):set(f2, 123):spawn()
+
+        local entity_list
+
+        entity_list = evo.multi_clone(2, prefab)
+        assert(entity_list and #entity_list == 2)
+        assert(entity_list[1] and evo.get(entity_list[1], f1) == true and evo.get(entity_list[1], f2) == 123)
+        assert(entity_list[2] and evo.get(entity_list[2], f1) == true and evo.get(entity_list[2], f2) == 123)
+
+        entity_list = evo.multi_clone(2, prefab, {})
+        assert(entity_list and #entity_list == 2)
+        assert(entity_list[1] and evo.get(entity_list[1], f1) == true and evo.get(entity_list[1], f2) == 123)
+        assert(entity_list[2] and evo.get(entity_list[2], f1) == true and evo.get(entity_list[2], f2) == 123)
+
+        entity_list = evo.multi_clone(2, prefab, { [f1] = false, [f2] = 456 })
+        assert(entity_list and #entity_list == 2)
+        assert(entity_list[1] and evo.get(entity_list[1], f1) == false and evo.get(entity_list[1], f2) == 456)
+        assert(entity_list[2] and evo.get(entity_list[2], f1) == false and evo.get(entity_list[2], f2) == 456)
+    end
+end
+
+do
+    local f1, f2, f3 = evo.id(3)
+
+    do
+        local entity_list1, entity_list2
+
+        evo.defer()
+        do
+            entity_list1 = evo.multi_spawn(2, { [f1] = 42, [f2] = "hello", [f3] = false })
+            assert(entity_list1 and #entity_list1 == 2)
+            assert(entity_list1[1] and evo.empty(entity_list1[1]))
+            assert(entity_list1[2] and evo.empty(entity_list1[2]))
+            assert(not entity_list1[3])
+
+            entity_list2 = evo.multi_spawn(3, { [f2] = "world", [f3] = true })
+            assert(entity_list2 and #entity_list2 == 3)
+            assert(entity_list2[1] and evo.empty(entity_list2[1]))
+            assert(entity_list2[2] and evo.empty(entity_list2[2]))
+            assert(entity_list2[3] and evo.empty(entity_list2[3]))
+        end
+        evo.commit()
+        do
+            assert(entity_list1 and #entity_list1 == 2)
+            assert(entity_list1[1] and not evo.empty(entity_list1[1]))
+            assert(entity_list1[2] and not evo.empty(entity_list1[2]))
+            assert(not entity_list1[3])
+            assert(
+                evo.get(entity_list1[1], f1) == 42 and
+                evo.get(entity_list1[1], f2) == "hello" and
+                evo.get(entity_list1[1], f3) == false)
+            assert(
+                evo.get(entity_list1[2], f1) == 42 and
+                evo.get(entity_list1[2], f2) == "hello" and
+                evo.get(entity_list1[2], f3) == false)
+
+            assert(entity_list2 and #entity_list2 == 3)
+            assert(entity_list2[1] and not evo.empty(entity_list2[1]))
+            assert(entity_list2[2] and not evo.empty(entity_list2[2]))
+            assert(entity_list2[3] and not evo.empty(entity_list2[3]))
+            assert(not entity_list2[4])
+            assert(
+                evo.get(entity_list2[1], f1) == nil and
+                evo.get(entity_list2[1], f2) == "world" and
+                evo.get(entity_list2[1], f3) == true)
+            assert(
+                evo.get(entity_list2[2], f1) == nil and
+                evo.get(entity_list2[2], f2) == "world" and
+                evo.get(entity_list2[2], f3) == true)
+            assert(
+                evo.get(entity_list2[3], f1) == nil and
+                evo.get(entity_list2[3], f2) == "world" and
+                evo.get(entity_list2[3], f3) == true)
+        end
+    end
+end
+
+do
+    local f1, f2, f3 = evo.id(3)
+
+    do
+        local prefab = evo.builder():set(f1, false):set(f2, 123):spawn()
+
+        local entity_list1, entity_list2
+
+        evo.defer()
+        do
+            entity_list1 = evo.multi_clone(2, prefab)
+            assert(entity_list1 and #entity_list1 == 2)
+            assert(entity_list1[1] and evo.empty(entity_list1[1]))
+            assert(entity_list1[2] and evo.empty(entity_list1[2]))
+            assert(not entity_list1[3])
+
+            entity_list2 = evo.multi_clone(3, prefab, { [f2] = 456, [f3] = "world" })
+            assert(entity_list2 and #entity_list2 == 3)
+            assert(entity_list2[1] and evo.empty(entity_list2[1]))
+            assert(entity_list2[2] and evo.empty(entity_list2[2]))
+            assert(entity_list2[3] and evo.empty(entity_list2[3]))
+        end
+        evo.commit()
+        do
+            assert(entity_list1 and #entity_list1 == 2)
+            assert(entity_list1[1] and not evo.empty(entity_list1[1]))
+            assert(entity_list1[2] and not evo.empty(entity_list1[2]))
+            assert(not entity_list1[3])
+            assert(
+                evo.get(entity_list1[1], f1) == false and
+                evo.get(entity_list1[1], f2) == 123 and
+                evo.get(entity_list1[1], f3) == nil)
+            assert(
+                evo.get(entity_list1[2], f1) == false and
+                evo.get(entity_list1[2], f2) == 123 and
+                evo.get(entity_list1[2], f3) == nil)
+
+            assert(entity_list2 and #entity_list2 == 3)
+            assert(entity_list2[1] and not evo.empty(entity_list2[1]))
+            assert(entity_list2[2] and not evo.empty(entity_list2[2]))
+            assert(entity_list2[3] and not evo.empty(entity_list2[3]))
+            assert(not entity_list2[4])
+            assert(
+                evo.get(entity_list2[1], f1) == false and
+                evo.get(entity_list2[1], f2) == 456 and
+                evo.get(entity_list2[1], f3) == "world")
+            assert(
+                evo.get(entity_list2[2], f1) == false and
+                evo.get(entity_list2[2], f2) == 456 and
+                evo.get(entity_list2[2], f3) == "world")
+            assert(
+                evo.get(entity_list2[3], f1) == false and
+                evo.get(entity_list2[3], f2) == 456 and
+                evo.get(entity_list2[3], f3) == "world")
+        end
+    end
+end

develop/untests.lua

@@ -598,29 +598,31 @@ do
     evo.set(e2b, f2, 45)
 
     do
-        local chunk, entities = evo.chunk(f1)
-        assert(entities and entities[1] == e1)
+        local chunk, entity_list, entity_count = evo.chunk(f1)
+        assert(entity_list and entity_list[1] == e1)
+        assert(entity_count and entity_count == 1)
         assert(chunk and chunk:components(f1)[1] == 41)
     end
 
     do
-        local chunk, entities = evo.chunk(f1, f2)
+        local chunk, entity_list, entity_count = evo.chunk(f1, f2)
         assert(chunk == evo.chunk(f1, f2))
         assert(chunk == evo.chunk(f1, f1, f2))
         assert(chunk == evo.chunk(f1, f1, f2, f2))
         assert(chunk == evo.chunk(f1, f2, f2, f1))
         assert(chunk == evo.chunk(f2, f1))
         assert(chunk == evo.chunk(f2, f1, f2, f1))
-        assert(entities and entities[1] == e2 and entities[2] == e2b)
+        assert(entity_list and entity_list[1] == e2 and entity_list[2] == e2b)
+        assert(entity_count and entity_count == 2)
         assert(chunk and chunk:components(f1)[1] == 42 and chunk:components(f2)[1] == 43)
         assert(chunk and chunk:components(f1)[2] == 44 and chunk:components(f2)[2] == 45)
     end
 
     do
-        local chunk123, entities123 = evo.chunk(f1, f2, f3)
-        local chunk321, entities321 = evo.chunk(f3, f2, f1)
-        assert(chunk123 and #entities123 == 0)
-        assert(chunk321 and #entities321 == 0)
+        local chunk123, entities123, entity123_count = evo.chunk(f1, f2, f3)
+        local chunk321, entities321, entity321_count = evo.chunk(f3, f2, f1)
+        assert(chunk123 and #entities123 >= 0 and entity123_count == 0)
+        assert(chunk321 and #entities321 >= 0 and entity321_count == 0)
         assert(chunk123 == chunk321 and entities123 == entities321)
     end
 end
@@ -1864,13 +1866,13 @@ do
             assert(evo.get(e3, f1) == nil and evo.get(e3, f2) == nil and evo.get(e3, f3) == 43)
 
             do
-                local chunk, chunk_entities = evo.chunk(f1, f2, f3)
-                assert(chunk and chunk_entities)
+                local chunk, chunk_entity_list, chunk_entity_count = evo.chunk(f1, f2, f3)
+                assert(chunk and chunk_entity_list and chunk_entity_count == 2)
 
-                assert(chunk_entities[1] == e3 and chunk_entities[2] == e1)
+                assert(chunk_entity_list[1] == e3 and chunk_entity_list[2] == e1)
 
-                assert(#chunk:components(f1) == 0)
-                assert(#chunk:components(f2) == 0)
+                assert(#chunk:components(f1) >= 0)
+                assert(#chunk:components(f2) >= 0)
                 assert(chunk:components(f3)[1] == 43 and chunk:components(f3)[2] == 50)
             end
         end
@@ -1906,22 +1908,22 @@ do
             assert(not evo.has(e3, f1) and evo.has(e3, f2) and evo.has(e3, f3))
 
             do
-                local chunk, chunk_entities = evo.chunk(f2)
-                assert(chunk and chunk_entities)
+                local chunk, chunk_entity_list, chunk_entity_count = evo.chunk(f2)
+                assert(chunk and chunk_entity_list and chunk_entity_count == 1)
 
-                assert(chunk_entities[1] == e1)
-                assert(#chunk:components(f1) == 0)
-                assert(#chunk:components(f2) == 0)
-                assert(#chunk:components(f3) == 0)
+                assert(chunk_entity_list[1] == e1)
+                assert(#chunk:components(f1) >= 0)
+                assert(#chunk:components(f2) >= 0)
+                assert(#chunk:components(f3) >= 0)
             end
 
             do
-                local chunk, chunk_entities = evo.chunk(f2, f3)
-                assert(chunk and chunk_entities)
+                local chunk, chunk_entity_list, chunk_entity_count = evo.chunk(f2, f3)
+                assert(chunk and chunk_entity_list and chunk_entity_count == 1)
 
-                assert(chunk_entities[1] == e3)
-                assert(#chunk:components(f1) == 0)
-                assert(#chunk:components(f2) == 0)
+                assert(chunk_entity_list[1] == e3)
+                assert(#chunk:components(f1) >= 0)
+                assert(#chunk:components(f2) >= 0)
                 assert(chunk:components(f3)[1] == 43)
             end
         end
@@ -1961,13 +1963,13 @@ do
             assert(not evo.has(e3, f1) and not evo.has(e3, f2) and not evo.has(e3, f3))
 
             do
-                local chunk, chunk_entities = evo.chunk(f1, f2, f3)
-                assert(chunk and chunk_entities)
+                local chunk, chunk_entity_list, chunk_entity_count = evo.chunk(f1, f2, f3)
+                assert(chunk and chunk_entity_list and chunk_entity_count == 0)
 
-                assert(next(chunk_entities) == nil)
-                assert(#chunk:components(f1) == 0)
-                assert(#chunk:components(f2) == 0)
-                assert(#chunk:components(f3) == 0)
+                assert(#chunk_entity_list >= 0)
+                assert(#chunk:components(f1) >= 0)
+                assert(#chunk:components(f2) >= 0)
+                assert(#chunk:components(f3) >= 0)
             end
         end
     end
@@ -2006,13 +2008,13 @@ do
             assert(not evo.has(e3, f1) and not evo.has(e3, f2) and not evo.has(e3, f3))
 
             do
-                local chunk, chunk_entities = evo.chunk(f1, f2, f3)
-                assert(chunk and chunk_entities)
+                local chunk, chunk_entity_list, chunk_entity_count = evo.chunk(f1, f2, f3)
+                assert(chunk and chunk_entity_list and chunk_entity_count == 0)
 
-                assert(next(chunk_entities) == nil)
-                assert(#chunk:components(f1) == 0)
-                assert(#chunk:components(f2) == 0)
-                assert(#chunk:components(f3) == 0)
+                assert(#chunk_entity_list >= 0)
+                assert(#chunk:components(f1) >= 0)
+                assert(#chunk:components(f2) >= 0)
+                assert(#chunk:components(f3) >= 0)
             end
         end
     end
@@ -2197,13 +2199,15 @@ do
     do
         local iter, state = evo.execute(q)
 
-        local chunk, entities = iter(state)
+        local chunk, entity_list, entity_count = iter(state)
         assert(chunk == evo.chunk(f2))
-        assert(entities and entities[1] == e2)
+        assert(entity_list and entity_list[1] == e2)
+        assert(entity_count == 1)
 
-        chunk, entities = iter(state)
+        chunk, entity_list, entity_count = iter(state)
         assert(not chunk)
-        assert(not entities)
+        assert(not entity_list)
+        assert(not entity_count)
     end
 end
 
@@ -2224,9 +2228,9 @@ do
     do
         local entity_sum = 0
 
-        for _, entities in evo.execute(q) do
-            assert(#entities > 0)
-            for _, e in ipairs(entities) do
+        for _, entity_list, entity_count in evo.execute(q) do
+            assert(entity_count > 0)
+            for _, e in ipairs(entity_list) do
                 entity_sum = entity_sum + e
             end
         end
@@ -2253,30 +2257,35 @@ do
 
     do
         local iter, state = evo.execute(q)
-        local chunk, entities = iter(state)
+        local chunk, entity_list, entity_count = iter(state)
         assert(chunk == evo.chunk(f1))
-        assert(entities and entities[1] == e1)
+        assert(entity_list and entity_list[1] == e1)
+        assert(entity_count == 1)
 
-        chunk, entities = iter(state)
+        chunk, entity_list, entity_count = iter(state)
         assert(not chunk)
-        assert(not entities)
+        assert(not entity_list)
+        assert(not entity_count)
     end
 
     evo.set(q, evo.EXCLUDES)
 
     do
         local iter, state = evo.execute(q)
-        local chunk, entities = iter(state)
+        local chunk, entity_list, entity_count = iter(state)
         assert(chunk == evo.chunk(f1))
-        assert(entities and entities[1] == e1)
+        assert(entity_list and entity_list[1] == e1)
+        assert(entity_count == 1)
 
-        chunk, entities = iter(state)
+        chunk, entity_list, entity_count = iter(state)
         assert(chunk == evo.chunk(f1, f2))
-        assert(entities and entities[1] == e2)
+        assert(entity_list and entity_list[1] == e2)
+        assert(entity_count == 1)
 
-        chunk, entities = iter(state)
+        chunk, entity_list, entity_count = iter(state)
         assert(not chunk)
-        assert(not entities)
+        assert(not entity_list)
+        assert(not entity_count)
     end
 end
 
@@ -2310,9 +2319,10 @@ do
 
     do
         local iter, state = evo.execute(q)
-        local chunk, entities = iter(state)
+        local chunk, entity_list, entity_count = iter(state)
         assert(chunk == evo.chunk(f1))
-        assert(entities and entities[1] == e1)
+        assert(entity_list and entity_list[1] == e1)
+        assert(entity_count == 1)
     end
 end
 
@@ -2448,7 +2458,7 @@ do
     local function collect_entities(q)
         local entities = {}
         for _, es, es_count in evo.execute(q) do
-            assert(#es == es_count)
+            assert(#es >= es_count)
             for _, e in ipairs(es) do
                 entities[#entities + 1] = e
             end
@@ -2462,7 +2472,7 @@ do
 
     do
         local entities = collect_entities(q1)
-        assert(#entities == 3)
+        assert(#entities >= 3)
         assert(entities[1] == e1)
         assert(entities[2] == e2)
         assert(entities[3] == e3)
@@ -2470,14 +2480,14 @@ do
 
     do
         local entities = collect_entities(q2)
-        assert(#entities == 2)
+        assert(#entities >= 2)
         assert(entities[1] == e2)
         assert(entities[2] == e3)
     end
 
     do
         local entities = collect_entities(q3)
-        assert(#entities == 1)
+        assert(#entities >= 1)
         assert(entities[1] == e2)
     end
 end
@@ -3246,36 +3256,36 @@ do
     local e = evo.spawn({ [f1] = 1, [f2] = 2, [f3] = 3, [f4] = 4, [f5] = 5 })
 
     local c, es = evo.chunk(f1, f2, f3, f4, f5)
-    assert(c and es and #es == 1 and es[1] == e)
+    assert(c and es and #es >= 1 and es[1] == e)
 
     do
         local c1, c2 = c:components(f1, f2)
-        assert(c1 and #c1 == 1 and c1[1] == 1)
-        assert(c2 and #c2 == 1 and c2[1] == 2)
+        assert(c1 and #c1 >= 1 and c1[1] == 1)
+        assert(c2 and #c2 >= 1 and c2[1] == 2)
     end
 
     do
         local c1, c2, c3 = c:components(f1, f2, f3)
-        assert(c1 and #c1 == 1 and c1[1] == 1)
-        assert(c2 and #c2 == 1 and c2[1] == 2)
-        assert(c3 and #c3 == 1 and c3[1] == 3)
+        assert(c1 and #c1 >= 1 and c1[1] == 1)
+        assert(c2 and #c2 >= 1 and c2[1] == 2)
+        assert(c3 and #c3 >= 1 and c3[1] == 3)
     end
 
     do
         local c1, c2, c3, c4 = c:components(f1, f2, f3, f4)
-        assert(c1 and #c1 == 1 and c1[1] == 1)
-        assert(c2 and #c2 == 1 and c2[1] == 2)
-        assert(c3 and #c3 == 1 and c3[1] == 3)
-        assert(c4 and #c4 == 1 and c4[1] == 4)
+        assert(c1 and #c1 >= 1 and c1[1] == 1)
+        assert(c2 and #c2 >= 1 and c2[1] == 2)
+        assert(c3 and #c3 >= 1 and c3[1] == 3)
+        assert(c4 and #c4 >= 1 and c4[1] == 4)
     end
 
     do
         local c1, c2, c3, c4, c5 = c:components(f1, f2, f3, f4, f5)
-        assert(c1 and #c1 == 1 and c1[1] == 1)
-        assert(c2 and #c2 == 1 and c2[1] == 2)
-        assert(c3 and #c3 == 1 and c3[1] == 3)
-        assert(c4 and #c4 == 1 and c4[1] == 4)
-        assert(c5 and #c5 == 1 and c5[1] == 5)
+        assert(c1 and #c1 >= 1 and c1[1] == 1)
+        assert(c2 and #c2 >= 1 and c2[1] == 2)
+        assert(c3 and #c3 >= 1 and c3[1] == 3)
+        assert(c4 and #c4 >= 1 and c4[1] == 4)
+        assert(c5 and #c5 >= 1 and c5[1] == 5)
     end
 end
 
@@ -3722,7 +3732,7 @@ do
 
     do
         local c1, c1_es = evo.chunk(f1)
-        assert(c1 and c1_es and #c1_es == 2)
+        assert(c1 and c1_es and #c1_es >= 2)
         assert(c1_es[1] == e1a and c1_es[2] == e1b)
         assert(c1:components(f1)[1] == 1 and c1:components(f1)[2] == 11)
     end
@@ -3731,10 +3741,10 @@ do
 
     do
         local c1, c1_es = evo.chunk(f1)
-        assert(c1 and c1_es and #c1_es == 0)
+        assert(c1 and c1_es and #c1_es >= 0)
 
         local c12, c12_es = evo.chunk(f1, f2)
-        assert(c12 and c12_es and #c12_es == 2)
+        assert(c12 and c12_es and #c12_es >= 2)
         assert(c12_es[1] == e1a and c12_es[2] == e1b)
         assert(c12:components(f1)[1] == 1 and c12:components(f1)[2] == 11)
         assert(c12:components(f2)[1] == 2 and c12:components(f2)[2] == 2)
@@ -3745,7 +3755,7 @@ do
 
     do
         local c1, c1_es = evo.chunk(f1)
-        assert(c1 and c1_es and #c1_es == 2)
+        assert(c1 and c1_es and #c1_es >= 2)
         assert(c1_es[1] == e1c and c1_es[2] == e1d)
         assert(c1:components(f1)[1] == 111 and c1:components(f1)[2] == 1111)
     end
@@ -3755,10 +3765,10 @@ do
 
     do
         local c1, c1_es = evo.chunk(f1)
-        assert(c1 and c1_es and #c1_es == 0)
+        assert(c1 and c1_es and #c1_es >= 0)
 
         local c12, c12_es = evo.chunk(f1, f2)
-        assert(c12 and c12_es and #c12_es == 4)
+        assert(c12 and c12_es and #c12_es >= 4)
         assert(c12_es[1] == e1a and c12_es[2] == e1b)
         assert(c12_es[3] == e1c and c12_es[4] == e1d)
         assert(c12:components(f1)[1] == 1 and c12:components(f1)[2] == 11)
@@ -3778,7 +3788,7 @@ do
 
     do
         local c123, c123_es = evo.chunk(f1, f2, f3)
-        assert(c123 and c123_es and #c123_es == 2)
+        assert(c123 and c123_es and #c123_es >= 2)
         assert(c123_es[1] == e123a and c123_es[2] == e123b)
         assert(c123:components(f1)[1] == 1 and c123:components(f1)[2] == 11)
         assert(c123:components(f2)[1] == 2 and c123:components(f2)[2] == 22)
@@ -3789,7 +3799,7 @@ do
 
     do
         local c13, c13_es = evo.chunk(f3, f1)
-        assert(c13 and c13_es and #c13_es == 2)
+        assert(c13 and c13_es and #c13_es >= 2)
         assert(c13_es[1] == e123a and c13_es[2] == e123b)
         assert(c13:components(f1)[1] == 1 and c13:components(f1)[2] == 11)
         assert(c13:components(f2)[1] == nil and c13:components(f2)[2] == nil)
@@ -3801,7 +3811,7 @@ do
 
     do
         local c3, c3_es = evo.chunk(f3)
-        assert(c3 and c3_es and #c3_es == 2)
+        assert(c3 and c3_es and #c3_es >= 2)
         assert(c3_es[1] == e3a and c3_es[2] == e3b)
         assert(c3:components(f3)[1] == 3 and c3:components(f3)[2] == 33)
     end
@@ -3810,7 +3820,7 @@ do
 
     do
         local c3, c3_es = evo.chunk(f3)
-        assert(c3 and c3_es and #c3_es == 4)
+        assert(c3 and c3_es and #c3_es >= 4)
         assert(c3_es[1] == e3a and c3_es[2] == e3b)
         assert(c3_es[3] == e123a and c3_es[4] == e123b)
         assert(c3:components(f1)[1] == nil and c3:components(f1)[2] == nil)
@@ -3833,13 +3843,13 @@ do
     do
         local c1, c1_es, c1_ec = evo.chunk(f1)
         assert(c1 and c1_es and c1_ec)
-        assert(c1_ec == 2 and #c1_es == 2 and c1_es[1] == e1a and c1_es[2] == e1b)
+        assert(c1_ec == 2 and #c1_es >= 2 and c1_es[1] == e1a and c1_es[2] == e1b)
     end
 
     do
         local c12, c12_es, c12_ec = evo.chunk(f1, f2)
         assert(c12 and c12_es and c12_ec)
-        assert(c12_ec == 1 and #c12_es == 1 and c12_es[1] == e12)
+        assert(c12_ec == 1 and #c12_es >= 1 and c12_es[1] == e12)
     end
 end
 
@@ -3897,14 +3907,14 @@ do
 
     do
         local c1_es, c1_ec = c1:entities()
-        assert(c1_es and #c1_es == 2 and c1_ec == 2)
+        assert(c1_es and #c1_es >= 2 and c1_ec == 2)
         assert(c1_es[1] == e1a and c1_es[2] == e1b)
 
         local c2_es, c2_ec = c2:entities()
-        assert(c2_es and #c2_es == 0 and c2_ec == 0)
+        assert(c2_es and #c2_es >= 0 and c2_ec == 0)
 
         local c12_es, c12_ec = c12:entities()
-        assert(c12_es and #c12_es == 2 and c12_ec == 2)
+        assert(c12_es and #c12_es >= 2 and c12_ec == 2)
         assert(c12_es[1] == e12a and c12_es[2] == e12b)
     end
 
@@ -3915,14 +3925,14 @@ do
 
     do
         local c1_es, c1_ec = c1:entities()
-        assert(c1_es and #c1_es == 0 and c1_ec == 0)
+        assert(c1_es and #c1_es >= 0 and c1_ec == 0)
 
         local c2_es, c2_ec = c2:entities()
-        assert(c2_es and #c2_es == 2 and c2_ec == 2)
+        assert(c2_es and #c2_es >= 2 and c2_ec == 2)
         assert(c2_es[1] == e12a and c2_es[2] == e12b)
 
         local c12_es, c12_ec = c12:entities()
-        assert(c12_es and #c12_es == 2 and c12_ec == 2)
+        assert(c12_es and #c12_es >= 2 and c12_ec == 2)
         assert(c12_es[1] == e1a and c12_es[2] == e1b)
     end
 end
@@ -3938,7 +3948,7 @@ do
         assert(evo.empty(f2))
 
         local c1_es, c1_ec = c1:entities()
-        assert(c1_es and #c1_es == 0 and c1_ec == 0)
+        assert(c1_es and #c1_es >= 0 and c1_ec == 0)
     end
 end
 
@@ -3949,7 +3959,7 @@ do
     evo.destroy(f1)
     do
         local c1_es, c1_ec = c1:entities()
-        assert(c1_es and #c1_es == 0 and c1_ec == 0)
+        assert(c1_es and #c1_es >= 0 and c1_ec == 0)
     end
 end
 
@@ -3964,26 +3974,26 @@ do
     evo.set(f2, f2)
     do
         local c1_es, c1_ec = c1:entities()
-        assert(c1_es and #c1_es == 0 and c1_ec == 0)
+        assert(c1_es and #c1_es >= 0 and c1_ec == 0)
 
         local c2_es, c2_ec = c2:entities()
-        assert(c2_es and #c2_es == 0 and c2_ec == 0)
+        assert(c2_es and #c2_es >= 0 and c2_ec == 0)
 
         local c12_es, c12_ec = c12:entities()
-        assert(c12_es and #c12_es == 1 and c12_ec == 1)
+        assert(c12_es and #c12_es >= 1 and c12_ec == 1)
         assert(c12_es[1] == f2)
     end
     evo.destroy(f1)
     do
         local c1_es, c1_ec = c1:entities()
-        assert(c1_es and #c1_es == 0 and c1_ec == 0)
+        assert(c1_es and #c1_es >= 0 and c1_ec == 0)
 
         local c2_es, c2_ec = c2:entities()
-        assert(c2_es and #c2_es == 1 and c2_ec == 1)
+        assert(c2_es and #c2_es >= 1 and c2_ec == 1)
         assert(c2_es[1] == f2)
 
         local c12_es, c12_ec = c12:entities()
-        assert(c12_es and #c12_es == 0 and c12_ec == 0)
+        assert(c12_es and #c12_es >= 0 and c12_ec == 0)
     end
 end
 
@@ -3998,25 +4008,25 @@ do
     evo.set(f2, f2)
     do
         local c1_es, c1_ec = c1:entities()
-        assert(c1_es and #c1_es == 0 and c1_ec == 0)
+        assert(c1_es and #c1_es >= 0 and c1_ec == 0)
 
         local c2_es, c2_ec = c2:entities()
-        assert(c2_es and #c2_es == 0 and c2_ec == 0)
+        assert(c2_es and #c2_es >= 0 and c2_ec == 0)
 
         local c12_es, c12_ec = c12:entities()
-        assert(c12_es and #c12_es == 1 and c12_ec == 1)
+        assert(c12_es and #c12_es >= 1 and c12_ec == 1)
         assert(c12_es[1] == f2)
     end
     evo.destroy(f1)
     do
         local c1_es, c1_ec = c1:entities()
-        assert(c1_es and #c1_es == 0 and c1_ec == 0)
+        assert(c1_es and #c1_es >= 0 and c1_ec == 0)
 
         local c2_es, c2_ec = c2:entities()
-        assert(c2_es and #c2_es == 0 and c2_ec == 0)
+        assert(c2_es and #c2_es >= 0 and c2_ec == 0)
 
         local c12_es, c12_ec = c12:entities()
-        assert(c12_es and #c12_es == 0 and c12_ec == 0)
+        assert(c12_es and #c12_es >= 0 and c12_ec == 0)
     end
 end
 
@@ -4028,20 +4038,20 @@ do
     evo.set(f3, f2)
     do
         local c1_es, c1_ec = c1:entities()
-        assert(c1_es and #c1_es == 1 and c1_ec == 1)
+        assert(c1_es and #c1_es >= 1 and c1_ec == 1)
         assert(c1_es[1] == f2)
 
         local c2_es, c2_ec = c2:entities()
-        assert(c2_es and #c2_es == 1 and c2_ec == 1)
+        assert(c2_es and #c2_es >= 1 and c2_ec == 1)
         assert(c2_es[1] == f3)
     end
     evo.destroy(f1)
     do
         local c1_es, c1_ec = c1:entities()
-        assert(c1_es and #c1_es == 0 and c1_ec == 0)
+        assert(c1_es and #c1_es >= 0 and c1_ec == 0)
 
         local c2_es, c2_ec = c2:entities()
-        assert(c2_es and #c2_es == 1 and c2_ec == 1)
+        assert(c2_es and #c2_es >= 1 and c2_ec == 1)
         assert(c2_es[1] == f3)
     end
 end
@@ -4055,20 +4065,20 @@ do
     evo.set(f3, f2)
     do
         local c1_es, c1_ec = c1:entities()
-        assert(c1_es and #c1_es == 1 and c1_ec == 1)
+        assert(c1_es and #c1_es >= 1 and c1_ec == 1)
         assert(c1_es[1] == f2)
 
         local c2_es, c2_ec = c2:entities()
-        assert(c2_es and #c2_es == 1 and c2_ec == 1)
+        assert(c2_es and #c2_es >= 1 and c2_ec == 1)
         assert(c2_es[1] == f3)
     end
     evo.destroy(f1)
     do
         local c1_es, c1_ec = c1:entities()
-        assert(c1_es and #c1_es == 0 and c1_ec == 0)
+        assert(c1_es and #c1_es >= 0 and c1_ec == 0)
 
         local c2_es, c2_ec = c2:entities()
-        assert(c2_es and #c2_es == 1 and c2_ec == 1)
+        assert(c2_es and #c2_es >= 1 and c2_ec == 1)
         assert(c2_es[1] == f3)
     end
 end
@@ -4082,20 +4092,20 @@ do
     evo.set(f3, f2)
     do
         local c1_es, c1_ec = c1:entities()
-        assert(c1_es and #c1_es == 1 and c1_ec == 1)
+        assert(c1_es and #c1_es >= 1 and c1_ec == 1)
         assert(c1_es[1] == f2)
 
         local c2_es, c2_ec = c2:entities()
-        assert(c2_es and #c2_es == 1 and c2_ec == 1)
+        assert(c2_es and #c2_es >= 1 and c2_ec == 1)
         assert(c2_es[1] == f3)
     end
     evo.destroy(f1)
     do
         local c1_es, c1_ec = c1:entities()
-        assert(c1_es and #c1_es == 0 and c1_ec == 0)
+        assert(c1_es and #c1_es >= 0 and c1_ec == 0)
 
         local c2_es, c2_ec = c2:entities()
-        assert(c2_es and #c2_es == 0 and c2_ec == 0)
+        assert(c2_es and #c2_es >= 0 and c2_ec == 0)
     end
 end
 
@@ -4122,14 +4132,14 @@ do
 
     do
         local c4_es, c4_ec = c4:entities()
-        assert(c4_es and #c4_es == 3 and c4_ec == 3)
+        assert(c4_es and #c4_es >= 3 and c4_ec == 3)
         assert(c4_es[1] == e24 and c4_es[2] == e14 and c4_es[3] == e124)
     end
 
-    assert(#c14:entities() == 0)
-    assert(#c24:entities() == 0)
-    assert(#c124:entities() == 0)
-    assert(#c234:entities() == 0)
+    assert(#c14:entities() >= 0)
+    assert(#c24:entities() >= 0)
+    assert(#c124:entities() >= 0)
+    assert(#c234:entities() >= 0)
 
     assert(evo.alive(e14) and not evo.empty(e14))
     assert(evo.alive(e24) and not evo.empty(e24))
@@ -4159,7 +4169,7 @@ do
         assert(remove_count == 1)
 
         local c1_es, c1_ec = c1:entities()
-        assert(c1_es and #c1_es == 0 and c1_ec == 0)
+        assert(c1_es and #c1_es >= 0 and c1_ec == 0)
     end
 end
 
@@ -4185,7 +4195,7 @@ do
         assert(remove_count == 1)
 
         local c1_es, c1_ec = c1:entities()
-        assert(c1_es and #c1_es == 0 and c1_ec == 0)
+        assert(c1_es and #c1_es >= 0 and c1_ec == 0)
     end
 end
 
@@ -4219,27 +4229,27 @@ do
     do
         local c1_es, c1_ec = c1:entities()
         assert(c1 and c1_es and c1_ec)
-        assert(c1_ec == 4 and #c1_es == 4)
+        assert(c1_ec == 4 and #c1_es >= 4)
         assert(c1_es[1] == e1a and c1_es[2] == e1b and c1_es[3] == e12a and c1_es[4] == e12b)
     end
 
     do
         local c12_es, c12_ec = c12:entities()
         assert(c12 and c12_es and c12_ec)
-        assert(c12_ec == 0 and #c12_es == 0)
+        assert(c12_ec == 0 and #c12_es >= 0)
     end
 
     do
         local c13_es, c13_ec = c13:entities()
         assert(c13 and c13_es and c13_ec)
-        assert(c13_ec == 2 and #c13_es == 2)
+        assert(c13_ec == 2 and #c13_es >= 2)
         assert(c13_es[1] == e123a and c13_es[2] == e123b)
     end
 
     do
         local c123_es, c123_ec = c123:entities()
         assert(c123 and c123_es and c123_ec)
-        assert(c123_ec == 0 and #c123_es == 0)
+        assert(c123_ec == 0 and #c123_es >= 0)
     end
 end
 
@@ -4291,7 +4301,7 @@ do
     do
         local c2, c2_es, c2_ec = evo.chunk(f2)
         assert(c2 and c2_es and c2_ec)
-        assert(#c2_es == 2 and c2_ec == 2)
+        assert(#c2_es >= 2 and c2_ec == 2)
         assert(c2_es[1] == e2a and c2_es[2] == e2b)
     end
 end
@@ -4324,7 +4334,7 @@ do
     do
         local c2, c2_es, c2_ec = evo.chunk(f2)
         assert(c2 and c2_es and c2_ec)
-        assert(#c2_es == 4 and c2_ec == 4)
+        assert(#c2_es >= 4 and c2_ec == 4)
         assert(c2_es[1] == e2a and c2_es[2] == e2b and c2_es[3] == e12a and c2_es[4] == e12b)
     end
 end
@@ -4349,10 +4359,10 @@ do
 
     assert(c1 and c23)
 
-    assert(#c1:fragments() == 1)
+    assert(#c1:fragments() >= 1)
     assert(c1:fragments()[1] == f1)
 
-    assert(#c23:fragments() == 2)
+    assert(#c23:fragments() >= 2)
     assert(c23:fragments()[1] == f2)
     assert(c23:fragments()[2] == f3)
 end
@@ -4372,20 +4382,23 @@ do
 
         local iter, state = evo.execute(q1)
 
-        local chunk, entity_list = iter(state)
-        assert(entity_list and #entity_list == 1)
+        local chunk, entity_list, entity_count = iter(state)
+        assert(entity_list and #entity_list >= 1)
+        assert(entity_count and entity_count == 1)
         assert(chunk == evo.chunk(f0, f1) and entity_list[1] == e1)
 
-        chunk, entity_list = iter(state)
-        assert(entity_list and #entity_list == 1)
+        chunk, entity_list, entity_count = iter(state)
+        assert(entity_list and #entity_list >= 1)
+        assert(entity_count and entity_count == 1)
         assert(chunk == evo.chunk(f0, f1, f2) and entity_list[1] == e12)
 
-        chunk, entity_list = iter(state)
-        assert(entity_list and #entity_list == 1)
+        chunk, entity_list, entity_count = iter(state)
+        assert(entity_list and #entity_list >= 1)
+        assert(entity_count and entity_count == 1)
         assert(chunk == evo.chunk(f0, f1, f2, f3) and entity_list[1] == e123)
 
-        chunk, entity_list = iter(state)
-        assert(not chunk and not entity_list)
+        chunk, entity_list, entity_count = iter(state)
+        assert(not chunk and not entity_list and not entity_count)
     end
 
     do
@@ -4393,16 +4406,18 @@ do
 
         local iter, state = evo.execute(q1)
 
-        local chunk, entity_list = iter(state)
-        assert(entity_list and #entity_list == 1)
+        local chunk, entity_list, entity_count = iter(state)
+        assert(entity_list and #entity_list >= 1)
+        assert(entity_count and entity_count == 1)
         assert(chunk == evo.chunk(f0, f1) and entity_list[1] == e1)
 
-        chunk, entity_list = iter(state)
-        assert(entity_list and #entity_list == 1)
+        chunk, entity_list, entity_count = iter(state)
+        assert(entity_list and #entity_list >= 1)
+        assert(entity_count and entity_count == 1)
         assert(chunk == evo.chunk(f0, f1, f2) and entity_list[1] == e12)
 
-        chunk, entity_list = iter(state)
-        assert(not chunk and not entity_list)
+        chunk, entity_list, entity_count = iter(state)
+        assert(not chunk and not entity_list and not entity_count)
     end
 end
 
@@ -4435,7 +4450,7 @@ do
 
         for c, es, ec in evo.execute(qe12) do
             assert(ec > 0)
-            assert(#es == ec)
+            assert(#es >= ec)
             assert(c ~= c1 and c ~= c2 and c ~= c12)
             matched_chunk_count = matched_chunk_count + 1
             matched_entity_count = matched_entity_count + ec
@@ -4453,7 +4468,7 @@ do
 
         for _, es, ec in evo.execute(qe12) do
             assert(ec > 0)
-            assert(#es == ec)
+            assert(#es >= ec)
             matched_chunk_count = matched_chunk_count + 1
             matched_entity_count = matched_entity_count + ec
         end
@@ -4468,7 +4483,7 @@ do
         local iter, state = evo.execute(qe12)
         local chunk, entity_list, entity_count = iter(state)
         assert(chunk == c12)
-        assert(entity_list and #entity_list == 1)
+        assert(entity_list and #entity_list >= 1)
         assert(entity_count and entity_count == 1)
         assert(entity_list[1] == e12)
     end
@@ -4495,7 +4510,7 @@ do
 
         local old_c1_es, old_c1_ec = old_c1:entities()
         assert(old_c1_es and old_c1_ec)
-        assert(#old_c1_es == 1 and old_c1_ec == 1)
+        assert(#old_c1_es >= 1 and old_c1_ec == 1)
         assert(old_c1_es[1] == e1)
     end
 
@@ -4507,7 +4522,7 @@ do
 
         local new_c12_es, new_c12_ec = new_c12:entities()
         assert(new_c12_es and new_c12_ec)
-        assert(#new_c12_es == 1 and new_c12_ec == 1)
+        assert(#new_c12_es >= 1 and new_c12_ec == 1)
         assert(new_c12_es[1] == e12)
     end
 

rockspecs/evolved.lua-1.2.0-0.rockspec

@@ -0,0 +1,34 @@
+rockspec_format = "3.0"
+package = "evolved.lua"
+version = "1.2.0-0"
+source = {
+   url = "git://github.com/BlackMATov/evolved.lua",
+   tag = "v1.2.0",
+}
+description = {
+   homepage = "https://github.com/BlackMATov/evolved.lua",
+   summary = "Evolved ECS (Entity-Component-System) for Lua",
+   detailed = [[
+      `evolved.lua` is a fast and flexible ECS (Entity-Component-System) library for Lua.
+      It is designed to be simple and easy to use, while providing all the features needed to create complex systems with blazing performance.
+   ]],
+   license = "MIT",
+   labels = {
+      "ecs",
+      "entity",
+      "entities",
+      "component",
+      "components",
+      "entity-component",
+      "entity-component-system",
+   },
+}
+dependencies = {
+   "lua >= 5.1",
+}
+build = {
+   type = "builtin",
+   modules = {
+      evolved = "evolved.lua",
+   }
+}