[issue38315] Provide defaultdict variant that passes key to default_factory

[Mark Amery]

Mark Amery <markamery at btinternet.com> added the comment:

I'm aware of __missing__. However, I don't think its existence is by itself a knockdown argument against doing this. __missing__ also fulfils the need satisfied by defaultdict, yet Python still has both - and the latter is almost always more convenient to use when it's possible to do so.

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<https://bugs.python.org/issue38315>
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