Tests

[librt.strings] Make various methods only accept positional args #20150

Job	Run time
Test mypyc suite with 32-bit Python	9m 53s
Test suite with py314-ubuntu, mypyc-compiled	15m 41s
Test suite with py313-ubuntu, mypyc-compiled	14m 52s
Test suite with py310-ubuntu, mypyc-compiled	15m 39s
Type check our own code (py310-ubuntu)	1m 45s
mypyc runtime tests with py313-macos	6m 37s
Test suite with py311-ubuntu	9m 28s
Test suite with py314t-ubuntu, mypyc-compiled	17m 47s
Parallel tests with py314-ubuntu, mypyc-compiled	30m 11s
Test suite with py312-ubuntu	10m 9s
Test suite with py314-windows-64	28m 11s
Parallel tests with py314-ubuntu, interpreted	24m 59s
mypyc runtime tests with py310-ubuntu	5m 45s
Type check our own code (py310-windows-64)	3m 32s
Formatting and code style with Black + ruff	1m 50s
	3h 16m 19s

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