Back to pull request #172

More efficient resolution of joiner contexts #196

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Job	Run time
build (3.7)	10s
build (3.8)	14s
mypy (3.8)	18s
mypy (3.9)	9s
build (3.9)	12s
mypy (3.10)	8s
build (3.10)	13s
mypy (3.11)	11s
build (3.11)	13s
mypy (3.12)	13s
build (3.12)	10s
build (pypy-3.9)	23s
build (3.5, ubuntu-20.04)	15s
build (3.6, ubuntu-20.04)	16s
	3m 5s