If I set this as the label for a device:The description appears as:
4
7
4
0

This is not correct - string_compare says it returns 0 when the strings are the same/

I think there may be a problem - It is like string_compare is doing the same thing as string_size.

Looks like already 10 years passed, but I have the same problem now in 6.44.3 version. It should be fixed!

The first post on the probe thread says to use -1 for false...

Cisco CPU
Type: Function
Available: if(oid("1.3.6.1.4.1.9.2.1.58.0")>0, 1, -1)

but -1 is true, try it...
[if(-1,"-1 is true","-1 is false")]

This incorrect information should corrected, anyhow why use -1 for false when 0 is precise unless you are passing a value to another function just use 0.
Great program but fixes are slow if at all.