[issue18864] Implementation for PEP 451 (importlib.machinery.ModuleSpec)

[Nick Coghlan]

Nick Coghlan added the comment:

And coming full circle: there's no *harm* in letting finders reject loading
into a target module, and that's orthogonal to having loaders reject it.
It's just that loaders that want to do that will currently still need to
implement load_module.

That means the only thing we need to postpone is the load_module
deprecation, since it still covers at least one advanced use case the new
API doesn't handle.

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