Perhaps I'm missing something obvious, but how would one go about to perform a case-insensitive comparison between two variables in CALM? E.g. I am overriding the include instruction in order to check for redundancies, but for obvious reasons I don't want to use a case-sensitive check when determining if a file's already been included.

If you mean a comparison of two string values, then there is no such operation. You'd have to implement it manually, and also adapt for the encoding that you would expect to use - fasm[g] by itself is encoding-unaware, it just treats any characters outside of 7-bit ASCII range as raw.

Also, even case-insensitive check is not a truly reliable method to determine whether two paths point to the same file. This in general would require some kind of specialized interface with OS. As fasm[g]'s core is written in an OS-independent way, things like file caching used internally always treats paths that differ in any way as pointing to different files - not only some OS-es (like Linux/Unix) might have case-sensitive filesystems, it is even conceivable that fasm[g] may be ported to an OS that uses a completely different set of rules for path building.

Hmm, I can see your point. OK, thanks for the info, Tomasz!

I'm off on a tangent, but I like to point to this guide as a demonstration what a can of worms path processing can be on Windows systems.