Python 3.10 Support

Stefano Riverarequested to merge
stefanor/tinyarray:python3.10 into master

In Python 3.10, NaNs no longer hash equal, instead they are hashed by their object's address. (See: https://bugs.python.org/issue43475)

Replace that behaviour by passing the address of the object to the hash() function.

This is all rather messy, I'm sure someone more familiar with C++ templates can do something a lot tidier...

Fixes: #20 (closed)

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