[docs] [issue16194] imp.load_dynamic imports wrong module when called several times on a multi-module .so

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

"""To prevent initializing an extension module more than
   once, we keep a static dictionary 'extensions' keyed by module name
   (for built-in modules) or by filename (for dynamically loaded
   modules), containing these modules.
"""
So there can be only one module per filename.
But what if this dictionary was keyed by tuple(name, filename) instead?

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nosy: +amaury.forgeotdarc

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