docs and find the other obsolete statements that no doubt lurk.
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PostgreSQL documentation
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<para>
User-defined type names cannot begin with the underscore character
- (<quote><literal>_</literal></quote>) and can only be 30
+ (<quote><literal>_</literal></quote>) and can only be 62
characters long (or in general <literal>NAMEDATALEN-2</>, rather than
the <literal>NAMEDATALEN-1</> characters allowed for other names).
Type names beginning with underscore are