(thanks to Olivier Blin)
p4raw-id: //depot/perl@24493
4_294_967_296 # underscore for legibility
0xff # hex
0xdead_beef # more hex
- 0377 # octal
+ 0377 # octal (only numbers, begins with 0)
0b011011 # binary
You are allowed to use underscores (underbars) in numeric literals