Dont' clobber the top bits for a length 1 encoding.
Dont' clobber the top bits for a length 1 encoding.

    We don't mask out the zero bit in the case where we have a multibyte
    sequence, but that's ok because we already tested that it's zero.

8l/myrddin,oridb/mc,oridb/mc,8l/myrddin,oridb/mc,oridb/mc