> Add new binary comparison operators IS NOT DISTINCT FROM and IS DISTINCT FROM that are equivalent to IS and IS NOT, respective, for compatibility with Postgre

> Add new binary comparison operators IS NOT DISTINCT FROM and IS DISTINCT FROM that are equivalent to IS and IS NOT, respective, for compatibility with PostgreSQL and SQL standards. In PG `IS` is not exactly the same as `IS NOT DISTINCT FROM`. I forget the details, but with row values these can have different meanings.