FIX: Testing for extension/signature mismatches shouldn't use sniff #1138
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Bug introduced in #1013 and reported in #1137. Added a test that fails with an unexpected error, and then updated
_signature_matches_extension
to not accept anysniff
. (If the file was compressed, the sniff would be read from the uncompressed stream. If it wasn't compressed, the sniff would be empty.)Some updates to make the same machinery work transparently for
.zst
.Closes #1137.