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Answers 37-45 in a ninth round of "What the user decided". Q24 and Q25 are answered, slugify's steps are rewritten (whitespace to _, strip, collapse runs of _, trim leading and trailing _ and -), groups get ids (overriding answer 9), and Q23 is restated around "a formula is a derived measure" with a worked example. Q23 stays open; Q26-Q34 are new. core.md section 20 notes that slugify predates the proposed rules. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze