[issue12740] Add struct.Struct.nmemb

[Meador Inge]

Meador Inge <meadori at gmail.com> added the comment:

The functionality part of the patch looks reasonable.  However, the pseudo-randomization in the unit tests seems like a bad idea.  Say someone is adding a new feature X.  Runs the unit tests to find one of them failing.  Then runs them again to investigate and they are now passing.  Unit tests should be repeatable.

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nosy: +meador.inge

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