chain: UTF8'
{{
  : utf+ ( $-$ )
    [ 1+ dup @ %11000000 and %10000000 = ] while ;

  : count ( $-$ )
    0 !here
    repeat dup @ 0; drop utf+ here ++ again ;
---reveal---
  : getLength ( $-n )
    count drop @here ;
}}
;chain

"møøse" ^UTF8'getLength putn