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07374a8251
The change introduced in 395ab5abd1
broke the signature of `requests.post`, among others, since
`MutableSequence` is invariant, and plain `Dict[str, str]` values
were no longer valid for the `data` argument.
This changes the signature to have `Any` components as a
compromise. Adding more items to the union seems a bit too much, since
the error messages for invalid argument types are already pretty hard to
read.
Another option might be to use `Mapping` instead of `MutableMapping`
due to covariance, but I assume there's a reason why `MutableMapping`
is used here.