Use parallel checking in self check (#21221)

JukkaL · web-flow · commit 0eb7292ccefb · 2026-04-14T19:55:46.000+01:00
Let's start dogfooding parallel type checking. This is about 3x faster
for a cold run than sequential on my mac laptop (not compiled).
diff --git a/mypy_self_check.ini b/mypy_self_check.ini
@@ -23,3 +23,4 @@ show_traceback = True
 
 # Miscellaneous
 sqlite_cache = True
+num_workers = 4
