this points to a very interesting property of the ACEs:
the upper limit on length is not a fixed value, it depends on the character
values used, even within a single script.
For ams-ace-m:
len maxlen enc minlen enc average
22 66 35 39.6
so most of the 5 Hangul names of length 22 are acceptable, but some are not.
This will be fun to explain to customers.....