POSKeyError subclasses KeyError.  While this makes sense conceptually,
it's really unfortunate in practice.  Application code that catches
key errors when getting an item from a container, will unintentionally
hide POSKeyErrors.

I propose to remove KeyError as a base class of POSKeyError.  While
this is a backward incompatible change, I can't imagine unbroken code
that intentionally catches POSKeyErrors via KeErrors.

If there are no objections, I'll make this change in 3.11.


Jim Fulton
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