Allow true/false, yes/no, 1/0. Throw elog warning if anything else.
Allow shorter strings, so "t", "tr", "tru" and "true" match "true".
Old behavior accepted anything starting with "t" as TRUE,
everything else as FALSE.
rather than just 't' and 'T'. This allows yes/no and 1/0
to be interpreted as one might expect.
Clean up function declarations to use bool as the type for arguments
and return values.
Add comparison operators to boolean and smaller/larger operators to datetime
and timespan. Fix int4 overflow math problem in timespan comparison operators.
Thomas G. Lockhart
Bruce Momjian
Marc G. Fournier