[no-release-notes] Refactor NaN and infinity checks into separate function #3268
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The changes made in #3265 were causing a regression in Doltgress (see dolthub/doltgresql#1946) since NaN and infinity are allowed in Doltgres. In order to fix the regression, the checks for NaN and infinity have been refactored into a function that can be overridden in Doltgres.
Accompanying PR dolthub/doltgresql#1951