Typically case-insensitivity is a filesystem feature rather than a pervasive feature -- if some programming language is case-sensitive (most are!) then that's w

Typically case-insensitivity is a filesystem feature rather than a pervasive feature -- if some programming language is case-sensitive (most are!) then that's what it has to be regardless of platform/OS. So your comment doesn't quite make sense. The problem here isn't case-sensitivity anyways. The problem is that many programmers think Y instead of y for years because that's how it is in many contexts. E.g., the C strftime() and strptime() functions use %Y for four-digit year. I don't think case sensitivity is a mistake. Case is a mistake. But we have it, and we have case-sensitive and case-insensitive things. It is what it is.