Correcting myself slightly, it was originally RFC1952 that was being
incorrectly referenced and that was changed to point to 1951 early on.
It may be that use with most libraries would require 1950/zlib and that
referencing DEFLATE isn't sufficient to specify the wire format. The point
was to avoid formats like gzip that presumed a lot of metadata about the
stream that was N/A to this use case.
If the DEFLATE scheme is itself enough to be "descriptive", then the spec,
IMHO, is correct. It may be that using zlib instead is preferable, and an
alternate encoding could be developed for that.
-- Scott