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archive/zip: FileHeader.Extra API is problematic #22520
See http://mdfs.net/Docs/Comp/Archiving/Zip/ExtraField and you will notice that it frequently describes a "Local-header version" and a "Central-header version", where the formats sometimes differ.
I haven't thought much about what the right action is moving forward, whether to deprecate this field or add new API. I just want to file this issue, so I remember to address it later.