[issue29102] Add an id field to PyInterpreterState.

[Nick Coghlan]

Nick Coghlan added the comment:

Yeah, I'm also fine with using int_fast64_t for the subinterpreter count.

The only thing I'm really advocating for strongly on that front is that I think it makes sense to sacrifice the sign bit in the ID field as an error indicator that provides a more idiomatic C API.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29102>
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