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Christoph Wille
519ed6e98c
EscapeIdentifier runs for every identifier token emitted, yet it built a StringBuilder plus a fresh result string even for the overwhelmingly common case of an identifier with no escapable characters. A pre-scan now returns the original instance untouched in that case, and the surrogate-pair copy appends the two chars directly instead of cutting a two-char substring. New unit tests pin the escaping behavior and the identity fast path. Assisted-by: Claude:claude-fable-5:Claude Code