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