Fix: PHP 8.1 pgsql change of return values #43
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As per https://php.watch/versions/8.1/PgSQL-resource, PostgreSQL
extension has moved away from resource objects and is now
returning opaque classes (PgSQL\Connection, Result, Lob).
These classes no longer provide default conversions to (int), so
a different approach is required, while maintaining compatibility
to older PHP versions.