Handle hyphens as post release separators in source distribution filenames #15644
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We currently have an edge case where we're not permitting source distribution filenames that use a hyphen as a post-release separator. This creates a confusing error message for users, as detailed in #14763 (comment).
Until we land #12245 and support PEP 625, we should permit them IFF the version in the filename exactly matches the provided version (otherwise, it's impossible to extract from the filename).