keyboard(6) lies

[Ethan Grammatikidis <eekee57@fastmail.fm>]

          After typing the compose key, type a lower case `x' and up
          to six hexadecimal characters (digits and `a' to `f') fol-
          lowed by a semicolon (if the sequence is less than six dig-
          its long) to type a single rune with the value represented
          by the typed number.

nope, doesn't work. i wanted to enter a literal ascii escape, so i typed
'alt, x, 1, b,' and the b appeared literally before i could enter the
semicolon. ''alt, x, 1,' had no effect. i tried a capital B, with no
change. the implication here is runes whose hex codes contain
non-decimal digits (or at least the hex digit 'b') cannot be entered.

system is 9front on r400, attempting to enter character into rio.