optionalCompression (Just Snappy)        = Just `fmap` [ "snappy" .= True, "deflate" .= False ]
optionalCompression (Just Snappy)        = Just `fmap` [ "snappy" .= True, "deflate" .= False ]
optionalCompression (Just Snappy)        = Just `fmap` [ "snappy" .= True, "deflate" .= False ]