- extract "java.lang.IO"
- tests for allowUnresolved
- more reliable works with varargs
(cherry picked from commit 8376baaa86afa3806cb096cffd42e9ed0db0d451)
(cherry picked from commit 78c8b1aed86c1414989a5a83b9e7d54ca5ed83e0)
IJ-MR-169535
GitOrigin-RevId: 704e1b94c19dbf07d5371b8989164070db2cd860