Steve Bennett wrote:
But in any case, I don't think the syntax/meaning of space indentation is likely to change, so this is a bit moot.
Indeed. To put this in historical perspective, I believe the use of indentation for source code (and preformatted text in general) can be traced back to Cunningham's original WikiWikiWeb. He may have got the idea from POD, which was introduced with about six months earlier with Perl 5. I'm not sure where the idea came from before that -- I suppose it's possible it was invented by Larry Wall, but it's also possible that he got the idea from some other markup language.