Allow decimal numbers in expressions use double to ensure floating point in expressions. r1666 | ffr | 2007-03-16 17:20:33 +1100 (Fri, 16 Mar 2007) | 3 lines
r1152 | ffr | 2006-10-16 09:37:29 +1000 (Mon, 16 Oct 2006) | 2 lines
r1138 | ffr | 2006-10-13 09:06:05 +1000 (Fri, 13 Oct 2006) | 2 lines