Range Types - symmetric

Hi,

Just a thought:

select int4range(5,2);
ERROR: range lower bound must be less than or equal to range upper bound

Of course, I won't argue this is a bug, but I was wondering if it wouldn't be handy to allow a
'symmetric' mode in range construction, where, if the first of the pair is higher than the second,
they are automatically swapped, similar to SYMMETRIC in the BETWEEN clause.

Admittedly, I don't have a specific 'use case' -- it might just often prevent 'manual' swapping
before range construction calls.

Thanks,

Erik Rijkers