Dave Evans wrote: > On Wed, Jan 03, 2007 at 08:46:28AM -0800, Marc Perkel wrote: > >> David Saez Padros wrote: >> >>> ... you are doing something wrong, only numbers should be >>> comprable with numbers. ... If the string to compare is not a number >>> (including an empty string) this is an error ... >>> > > FWIW I concur with that. Performing numeric operations on non-numeric > operands is an error, and should be detected and stopped ASAP. > > >> A null and a blank string are not the same thing either. Are you going >> to treat strings that way too? >> > > Not a fair comparison IMO, because although variables can be null, the result > of string expansion can (AFAIK) never be null. (e.g. h_Cc may be null, but > expanding $h_Cc: yields the empty string). Since the operands of string ops > (e.g. eq) are always acquired by first performing a string expansion, which > can *only* yield a (possibly empty) string, the operands can never be anything > but strings. Unless I've missed something. >
What you're missing is that by using your logic expanding a null should be an error. Why should expanding a null be an empty string? Nulls and empty strings are not the same thing. Technically null <> "" just like null <> 0 -- ## List details at http://www.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://www.exim.org/eximwiki/
