Importing a non-existent package calls Universal::import rather than giving an error? Why do we want that behavior?
It seems to me that something like you propose used to exist! I recall getting an error when the package didn't match the name. Maybe this was in there before, or still is but doesn't work anymore?
If you warn that package_Foo doesn't exist after reading Foo.pm, that's a general warning that's good anywhere: the file may have been renamed, you might have fat-fingered the package line when writing it, it might be a symlink, etc. If you are going to make it windows-only, check that some package does exist that's a case mismatch, rather than the target just not existing. To make it complete, need a no warnings 'package_load' as well.
—John
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