Garen Torikian <gjtorikian(at)gmail(dot)com> writes:
>> Perhaps the docs are a bit unclear about that, but it's not
>> restricted to ASCII alphanumerics. AFAICS the code will accept
>> whatever iswalpha() and iswdigit() will accept in the database's
>> default locale.
> Sorry but I don't think that is correct. Here is the single
> definition check of what constitutes a valid character:
> https://github.com/postgres/postgres/blob/c3315a7da57be720222b119385ed0f7ad7c15268/contrib/ltree/ltree.h#L129
> As you can see, there are no `is_*` calls at all.
Did you chase down what t_isalpha and t_isdigit do?
regards, tom lane