Tests

[mypyc] Document recent additions to `librt.strings`, such as `ispace… #22674

Job	Run time
Test mypyc suite with 32-bit Python	12m 7s
Test suite with py311-ubuntu	9m 54s
Formatting and code style with Black + ruff	1m 54s
Type check our own code (py310-windows-64)	1m 58s
Test suite with py313-ubuntu, mypyc-compiled	15m 49s
Test suite with py310-ubuntu, mypyc-compiled	16m 58s
Parallel tests with py314-windows-64, interpreted	11m 46s
Test suite with py315-ubuntu, mypyc-compiled	16m 12s
Parallel tests with py314-ubuntu, interpreted	27m 56s
mypyc runtime tests with py310-ubuntu	7m 48s
Test suite with py314-ubuntu, mypyc-compiled	16m 2s
Test suite with py314-windows-64	32m 12s
Test suite with py314t-ubuntu, mypyc-compiled	18m 32s
Parallel tests with py314-ubuntu, mypyc-compiled	26m 44s
Test suite with py312-ubuntu	10m 8s
Type check our own code (py310-ubuntu)	1m 13s
mypyc runtime tests with py313-macos	7m 35s
	3h 54m 48s

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