Roadmap

Backlog

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

We can return deferred status from modifying operations and spawn/clone methods.
Should we make one builder:build method instead of :spawn and :clone?
Should we cache the result of without_unique_fragments to clone faster?