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should be union; we want to exclude dangling refs

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jan 2023-04-07 16:55:50 -07:00
commit a07446808a
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masque/library.py
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@ -781,7 +781,7 @@ class MutableLibrary(Library, MutableMapping[str, 'Pattern'], metaclass=ABCMeta)
keep |= set(tops)
new = type(self)()
for key in keep - set(self.keys()):
for key in keep & set(self.keys()):
new._merge(key, self, key)
return new