rather than being disallowed.
Notes
- User-defined type names cannot begin with the underscore character
- (_) and can only be 62 characters
+ User-defined type names should not begin with the underscore character
+ (_) and should only be 62 characters
long (or in general NAMEDATALEN - 2, rather than
the NAMEDATALEN - 1 characters allowed for other
names). Type names beginning with underscore are reserved for