Tests

TEST: TypeVar defaults #294

Job	Run time
Test mypyc suite with 32-bit Python	8m 15s
Test suite with py38-ubuntu, mypyc-compiled	1m 17s
Test suite with py38-windows-64	27m 16s
Test suite with py39-ubuntu	19m 30s
Test suite with py310-ubuntu	17m 39s
Test suite with py311-ubuntu, mypyc-compiled	1m 11s
Test suite with py312-ubuntu, mypyc-compiled	1m 14s
mypyc runtime tests with py39-macos	5m 40s
mypyc runtime tests with py38-debug-build-ubuntu	5m 17s
Type check our own code (py38-ubuntu)	1m 37s
Type check our own code (py38-windows-64)	2m 26s
Formatting and code style with Black + ruff	42s
	1h 32m 4s

Provide feedback