When I test the domain name in IDNA 2008 in an Erlang implementation, I get an error:
Eshell V10.3.1 (abort with ^G)
1> idna:encode("x{10D}echy.example").
** exception exit: {bad_label,{alabel,"The label \"x{10D}echy\" is not a valid A-label: ulabel error={bad_label,\n {context,\n \"Codepoint 123 not allowed ('DISALLOWED') at posion 1 in \\\"x{10d}echy\\\"\"}}"}}
in function idna:alabel/1 (/Users/varnerac/xmpp_light/_build/default/lib/idna/src/idna.erl, line 277)
in call from idna:encode_1/2 (/Users/varnerac/xmpp_light/_build/default/lib/idna/src/idna.erl, line 145)