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gh-75223: Reject undotted extensions in `mimetypes.add_type()` #256748

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gh-75223: Reject undotted extensions in `mimetypes.add_type()`

gh-75223: Reject undotted extensions in `mimetypes.add_type()` #256748

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Job	Run time
DO-NOT-MERGE	4s
Unresolved review	3s
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