[issue19944] Make importlib.find_spec load packages as needed

[Nick Coghlan]

Nick Coghlan added the comment:

Look at it from a conceptual point of view, though, there are two quite
different operations:

- find a spec at the current level, using the specified path (which may be
empty, implying a top level import)
- find a spec according to the full import cycle, including any parent
module imports

When you call it, you're going to want one behaviour or the other, since
the two operations are not slight variants, they have major conceptual
differences (with one being a substep of the other).

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