[issue43521] Allow `ast.unparse` to handle NaNs and empty sets

[Batuhan Taskaya]

Batuhan Taskaya <isidentical at gmail.com> added the comment:

The reason that we weren't support these cases was there were simply no way achieve them by parsing code so we simply ignored (empty sets etc). Though considering that you have a decent use case in hy, I'd agree that these small additions are viable.

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<https://bugs.python.org/issue43521>
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