The same FAQ has a question "Why is it case/style insensitive?" and an answer giving four reasons, <i>none</i> of which supports "style insensitivity" in any way.<p>"Style insensitivity" means that in Nim the following identifiers are treated as equivalent: nOpenFiles, no_pen_files, Nope_NFiles. Insertion and removal of underscores, as well as case, is ignored. I hope you weren't expecting to find anything in your codebase using grep.<p>It seems a reasonable guess that, oh, maybe 99% of people wondering why Nim is "case/style insensitive" are more worried about "style insensitivity" than about mere "case insensitivity". (The other 1% haven't yet learned that Nim is "style insensitive".)