1 files changed, 10 insertions, 10 deletions

diff --git a/src/lutf8lib.js b/src/lutf8lib.js
index f581a9e..4298a33 100644
--- a/src/lutf8lib.js
+++ b/src/lutf8lib.js
@@ -59,8 +59,8 @@ const utflen = function(L) {
     let posi = u_posrelat(lauxlib.luaL_optinteger(L, 2, 1), len);
     let posj = u_posrelat(lauxlib.luaL_optinteger(L, 3, -1), len);
 
-    lauxlib.luaL_argcheck(L, 1 <= posi && --posi <= len, 2, lua.to_luastring("initial position out of string"));
-    lauxlib.luaL_argcheck(L, --posj < len, 3, lua.to_luastring("final position out of string"));
+    lauxlib.luaL_argcheck(L, 1 <= posi && --posi <= len, 2, "initial position out of string");
+    lauxlib.luaL_argcheck(L, --posj < len, 3, "final position out of string");
 
     while (posi <= posj) {
         let dec = utf8_decode(s, posi);
@@ -78,7 +78,7 @@ const utflen = function(L) {
 
 const pushutfchar = function(L, arg) {
     let code = lauxlib.luaL_checkinteger(L, arg);
-    lauxlib.luaL_argcheck(L, 0 <= code && code <= MAXUNICODE, arg, lua.to_luastring("value out of range", true));
+    lauxlib.luaL_argcheck(L, 0 <= code && code <= MAXUNICODE, arg, "value out of range");
     lua.lua_pushstring(L, lua.to_luastring(String.fromCodePoint(code)));
 };
 
@@ -111,14 +111,14 @@ const byteoffset = function(L) {
     let posi = n >= 0 ? 1 : s.length + 1;
     posi = u_posrelat(lauxlib.luaL_optinteger(L, 3, posi), s.length);
 
-    lauxlib.luaL_argcheck(L, 1 <= posi && --posi <= s.length, 3, lua.to_luastring("position out of range", true));
+    lauxlib.luaL_argcheck(L, 1 <= posi && --posi <= s.length, 3, "position out of range");
 
     if (n === 0) {
         /* find beginning of current byte sequence */
         while (posi > 0 && iscont(s[posi])) posi--;
     } else {
         if (iscont(s[posi]))
-            lauxlib.luaL_error(L, lua.to_luastring("initial position is a continuation byte", true));
+            lauxlib.luaL_error(L, "initial position is a continuation byte");
 
         if (n < 0) {
             while (n < 0 && posi > 0) {  /* move back */
@@ -155,19 +155,19 @@ const codepoint = function(L) {
     let posi = u_posrelat(lauxlib.luaL_optinteger(L, 2, 1), s.length);
     let pose = u_posrelat(lauxlib.luaL_optinteger(L, 3, posi), s.length);
 
-    lauxlib.luaL_argcheck(L, posi >= 1, 2, lua.to_luastring("out of range", true));
-    lauxlib.luaL_argcheck(L, pose <= s.length, 3, lua.to_luastring("out of range", true));
+    lauxlib.luaL_argcheck(L, posi >= 1, 2, "out of range");
+    lauxlib.luaL_argcheck(L, pose <= s.length, 3, "out of range");
 
     if (posi > pose) return 0;  /* empty interval; return no values */
     if (pose - posi >= Number.MAX_SAFE_INTEGER)
-        return lauxlib.luaL_error(L, lua.to_luastring("string slice too long", true));
+        return lauxlib.luaL_error(L, "string slice too long");
     let n = (pose - posi) + 1;
-    lauxlib.luaL_checkstack(L, n, lua.to_luastring("string slice too long", true));
+    lauxlib.luaL_checkstack(L, n, "string slice too long");
     n = 0;
     for (posi -= 1; posi < pose;) {
         let dec = utf8_decode(s, posi);
         if (dec === null)
-            return lauxlib.luaL_error(L, lua.to_luastring("invalid UTF-8 code", true));
+            return lauxlib.luaL_error(L, "invalid UTF-8 code");
         lua.lua_pushinteger(L, dec.code);
         posi = dec.pos;
         n++;