[issue42051] plistlib inherits XML vulnerabilities: we should document them

[Ronald Oussoren]

Ronald Oussoren <ronaldoussoren at mac.com> added the comment:

The PR is fairly simple: Just reject files with entity declarations as invalid files. Adding an option to accept entity declarations should not be necessary as Apple tools won't accept these declarations.

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<https://bugs.python.org/issue42051>
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