bug fix - https://github.com/lua/lua/commit/c23f7053495934bc7fbce7328af1e7f03f248de1

client/deps/liblua/llex.c

@@ -131,6 +131,8 @@ TString *luaX_newstring(LexState *ls, const char *str, size_t l) {
            table has no metatable, so it does not need to invalidate cache */
         setbvalue(o, 1);  /* t[string] = true */
         luaC_checkGC(L);
+    } else {  /* string already present */
+        ts = rawtsvalue(keyfromval(o));  /* re-use value previously stored */
     }
     L->top--;  /* remove string from stack */
     return ts;

client/deps/liblua/ltable.h

@@ -17,6 +17,10 @@
 
 #define invalidateTMcache(t) ((t)->flags = 0)
 
+/* returns the key, given the value of a table entry */
+#define keyfromval(v) \
+  (gkey(cast(Node *, cast(char *, (v)) - offsetof(Node, i_val))))
+
 
 LUAI_FUNC const TValue *luaH_getint(Table *t, int key);
 LUAI_FUNC void luaH_setint(lua_State *L, Table *t, int key, TValue *value);