socket: if_indextoname & co missing
The socket module shipped with pypy lacks some functions around the conversion between interface names and numbers (useful eg. when implementing multicast components in networking protocols) and appear to be relatively straight forward wrappers around
Both those are present since 3.3 in cpython. I've tested PyPy 7.3 for their presence, and found no mention of them in the current source code. Please consider adding them.
(This is somewhat related to #3198 which had if_nameindex in its list).
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