What steps will reproduce the problem?
1. bitmatch this: 
{ im: 32: littleendian } 

Works fine for some values and not for others

What is the expected output? What do you see instead?
An unsigned int32 is expected But a signed int32 is given.
I also tried putting the attribute unsigned, but it didn't change anything

What version of the product are you using? On what operating system?
I'm using version 2.0.3 on Ubuntu 12.04

Please provide any additional information below.