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parse-feat's paren-open handler stripped the grouping parens and returned the inner feature, leaving any trailing ident (like `em`) as a separate top-level feature. After consuming the closing paren, now checks if the next token is a non-keyword ident or `%` op and wraps as (string-postfix inner unit), making `(0 + 1) em` → "1em". Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>