The realisation: I used a $cgi->comment()
block to
throw in some debugging comments in a CGI script, and lo and behold every
line but the first had a space in front of it. For some reason, today it
reminded me of the $cgi->p()
formatting, which will put a
space between each argument if it's given a list. I'm guessing this
'join with a space' behaviour is going all the way through the rest of the
CGI module routines.
The solution: Write my own <pre> formatter routine, which just prints '<pre>', the text, and '</pre>'. Ugh. There's probably a better way somewhere in CGI, but at least I know what's going wrong.
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