Eagerly resolve discriminated unions and cache cases where we can't #10264

Job	Run time
test memray	5m 39s
docs-build	1m 51s
lint 3.7	1m 14s
lint 3.8	1m 17s
test ubuntu / 3.7	2m 11s
test fastapi	1m 52s
test ubuntu / 3.8	2m 3s
lint 3.9	1m 22s
mypy 1.0.1 / 3.10	7m 1s
lint 3.10	1m 7s
test ubuntu / 3.9	2m 4s
mypy lockfile / 3.10	4m 10s
lint 3.11	1m 37s
mypy 1.2.0 / 3.10	5m 35s
test ubuntu / 3.10	3m 57s
mypy 1.4.1 / 3.10	4m 10s
test ubuntu / 3.11	2m 23s
mypy 1.5.1 / 3.10	3m 45s
test typing-extensions 4.6.1 on Python 3.8	2m 21s
test macos / 3.7	3m 6s
mypy lockfile / 3.7	5m 50s
test typing-extensions 4.6.1 on Python 3.9	3m 6s
test macos / 3.8	3m 33s
mypy lockfile / 3.8	3m 49s
test typing-extensions 4.6.1 on Python 3.10	3m 20s
test macos / 3.9	4m 19s
mypy lockfile / 3.9	5m 6s
test typing-extensions 4.6.1 on Python 3.11	2m 35s
test macos / 3.10	3m 54s
mypy lockfile / 3.11	5m 9s
test typing-extensions main on Python 3.8	2m 52s
test macos / 3.11	3m 47s
test typing-extensions main on Python 3.9	2m 46s
test windows / 3.7	3m 30s
test typing-extensions main on Python 3.10	3m 8s
test windows / 3.8	3m 56s
test typing-extensions main on Python 3.11	2m 37s
test windows / 3.9	4m 18s
test typing-extensions 4.6.1 on Python 3.7	1m 40s
test windows / 3.10	3m 54s
test windows / 3.11	6m 55s
test ubuntu / pypy3.7	7m 42s
test ubuntu / pypy3.8	8m 1s
test ubuntu / pypy3.9	7m 33s
coverage-combine	25s
check	2s
release	0s
Send tweet	0s
	2h 42m 32s

Provide feedback