I think the end of sentence space looks much better with two than one in monospace font, but I'm not especially bothered either way. When there is one space, it looks more like an abbreviation.
I'm mindful that if I do that in shared code, some people will decide I'm incompetent, old or something worse (instead of reading the actual code; people can be petty), so I'll modify my writing style to please others.
This HN comment has double spaces after the end of a sentence. Not that you can see it.
I think it's a shame HTML ruined the possibility of typographically pleasing sentence spacing that looks distinct from abbreviations. Way back, I used to add wider end of sentence spaces in HTML when running it through generators (like Markdown to HTML).
