Comparison with `is`

[BeneCollyridam]

Code choice

In firebsae_admin/_token_gen.py line 290-291
I noticed the sub-expression: payload.get('v') is 0 and I was wondering if this shouldn't be payload.get('v') == 0.

I know that integers from -5 to 256 are cached in CPython, but I don't think it is good to rely on that when checking for equality (if that is the case).

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[hiranya911]

Fixed in #384