The attached patch implements the soundex difference function which

Neil Conway <neilc@samurai.com>

Commit: 1ac9f0e9f79c02a48c374dee206d3952e5520f84
Author: Neil Conway <neilc@samurai.com>
Date: 2005-01-26T08:04:04Z
Releases: 8.1.0
The attached patch implements the soundex difference function which
compares two strings' soundex values for similarity, from Kris Jurka.
Also mark the text_soundex() function as STRICT, to avoid crashing
on NULL input.

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