Remove useless assertions

Peter Eisentraut <peter@eisentraut.org>

Commit: 503e3833ef240c94e114be8703046d52f24da021
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2022-07-13T09:43:40Z
Releases: 16.0
Remove useless assertions

We don't need Assert(IsA(foo, String)) right before running
strVal(foo), since strVal() already does the assertion internally (via
castNode()).

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