Hmph. Should've hit the "preview" button. That "P↦S" is supposed to be "P&S". Sorry. (Guess this means that in LJ comments I don't need to escape the ampersands like I've been doing after all?)
You do need to escape the ampersands, but it's &, and you had "map" (and I was wondering what ↦ was supposed to be until I got to this comment).
Ah, but improperly escaping the ampersand meant that it was essentially an unescaped ampersand, and it still displayed as an ampersand, which was what surprised me. So I'm guessing that I only need to escape them when they precede something which could be a valid &-code.
(Urk. Experiments: "this&that" "foo & bar" In a moment I'll find out whether those display the way I wrote them.)
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(Urk. Experiments: "this&that" "foo & bar" In a moment I'll find out whether those display the way I wrote them.)