less ad-hoc verision of educated guess: guess identity of declaration morphism wrt. canonical morphism rather than observing particular effects of declaration morphisms only;
n.b. this fullfills promise given in 63c7b29d29ac
#
# Author: Makarius
#
# recode.pl - recode utf8 for ML
#
for (@ARGV) {
utf8::upgrade($_);
s/([\x80-\xff])/\\${\(ord($1))}/g;
print $_, " ";
}