Request: A compression program

[M.I.5¾]

LOL! There's no question that the apostrophe is spurious. It's flat
out wrong. But it wasn't just a typo. I actually noticed it when I
wrote the message, deleted it, then decided that xs looked very
confusing. So I changed it to "x"s, and then changed it back, because
that made it 16 bytes.

Either way, I think my point was clear.

Having relooked at this, it seems your apostrophe was not as spurious as I
first thought. Although an apostrophe is generally grammatically wrong in a
plural, there are, as ever, exceptions to the rule. Your example is in fact
one of them as you are refering to the x's themselves and not what the
symbol represents (crap explanation but the best I can do this time of the
morning).

Another example is where you are refering to the word itself and not what it
represents as in:

I'll take no if's or but's from you.

Your point was spot on though.