if sp > 0 && !isTokenBoundary(v[sp-1]) {
			continue
		}
		// Check that end pos is on a valid token boundary.
		if endPos := sp + len(token); endPos != len(v) && !isTokenBoundary(v[endPos]) {
			continue
		}
		if ascii.EqualFold(v[sp:sp+len(token)], token) {
			return true
		}
	}
	return false
}

func isTokenBoundary(b byte) bool {
	return b == ' ' || b == ',' || b == '\t'