Mapping
s first type parameter should be covariant
#268
Labels
based
non-standard/breaking change (something you'd want to disable if developing a lib)
type checking / linting
issues relating to existing diagnostic rules or proposals for new diagnostic rules
Attention!
Basedmypy supports this feature
Issue
There are many many issues around about this
backwards compatibility assurance
there is a vary low chance of breaking edge cases of implementations of
Mapping
that abuse the invariant param:I believe that this would be extremely rare in real life.
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