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display_name validation gains a rule: at most 5 special characters — the '.' / '_' punctuation (spaces, which separate words, don't count) — so a still-well-formed name can't be mostly punctuation. Mirrored in the Go ValidateDisplayName and the UI validDisplayName; both unit-tested (5 ok, 6 rejected, 'J. R. R. Tolkien' ok). Docs: FUNCTIONAL (+ _ru).