getvalue and alike returns Postgresql.null for NULL values #56
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I got hard to track down bugs because Postgresql.null was not used consistently in both directions.
It was used in the direction Caml -> Postgres only. As postgresql.null = "" this should not break any existing code, but could allow simplifying (or even fix ;-) some existing code.
Because, PQgetisnull is called from C at each getvalue, it could slow down code that do not use a lot NULL values, but speedup code that use them a lot by if one removes the need to call Postgress.getisnull.