GuString is now an ordinary C string - it makes live easier. In addition PgfSymbolKS, PgfExprFun and PgfLiteralStr now keep their strings as embedded flexible arrays. The latest change gives us the same compactness as the old representation but it is a lot easier to use.

src/runtime/c/pgf/parseval.c

@@ -111,7 +111,7 @@ pgf_metrics_lzn_end_phrase2(PgfLinFuncs** funcs, PgfCId cat, int fid, int lin_id
 			
 			if (phrase->start == start &&
 				phrase->end   == end &&
-				gu_string_eq(phrase->cat, cat) &&
+				strcmp(phrase->cat, cat) == 0 &&
 				phrase->lin_idx == lin_idx) {
 				state->matches++;
 				break;