[CF 5623] Make numeric type accessible to third-party code.

This branch was automatically generated by a robot using patches from an
email thread registered at:

https://commitfest.postgresql.org/patch/5623

The branch will be overwritten each time a new patch version is posted to
the thread, and also periodically to check for bitrot caused by changes
on the master branch.

Patch(es): https://www.postgresql.org/message-id/CAJBL5DOz9=QZaXsAgMEt46OdGcWws3hpy3SCBEyqXhHGXqrz1A@mail.gmail.com
Author(s): Ed Behn

Author: Commitfest Bot