diff --git a/lcode.c b/lcode.c
index 5ff659d0..8e0b443d 100644
--- a/lcode.c
+++ b/lcode.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lcode.c,v 2.62 2012/08/16 17:34:28 roberto Exp $
+** $Id: lcode.c,v 2.63 2013/04/15 15:43:34 roberto Exp roberto $
 ** Code generator for Lua
 ** See Copyright Notice in lua.h
 */
@@ -30,7 +30,7 @@
 
 
 static int isnumeral(expdesc *e) {
-  return (e->k == VKNUM && e->t == NO_JUMP && e->f == NO_JUMP);
+  return (e->k == VKFLT && e->t == NO_JUMP && e->f == NO_JUMP);
 }
 
 
@@ -322,6 +322,13 @@ int luaK_stringK (FuncState *fs, TString *s) {
 }
 
 
+static int luaK_intK (FuncState *fs, lua_Integer n) {
+  TValue o;
+  setivalue(&o, n);
+  return addk(fs, &o, &o);
+}
+
+
 int luaK_numberK (FuncState *fs, lua_Number r) {
   int n;
   lua_State *L = fs->ls->L;
@@ -333,8 +340,11 @@ int luaK_numberK (FuncState *fs, lua_Number r) {
     n = addk(fs, L->top - 1, &o);
     L->top--;
   }
-  else
-    n = addk(fs, &o, &o);  /* regular case */
+  else {
+    TValue k;
+    setnvalue(&k, r + 0.5);  /* ???? (avoid some collisions with ints) */
+    n = addk(fs, &k, &o);  /* regular case */
+  }
   return n;
 }
 
@@ -432,10 +442,14 @@ static void discharge2reg (FuncState *fs, expdesc *e, int reg) {
       luaK_codek(fs, reg, e->u.info);
       break;
     }
-    case VKNUM: {
+    case VKFLT: {
       luaK_codek(fs, reg, luaK_numberK(fs, e->u.nval));
       break;
     }
+    case VKINT: {
+      luaK_codek(fs, reg, luaK_intK(fs, e->u.ival));
+      break;
+    }
     case VRELOCABLE: {
       Instruction *pc = &getcode(fs, e);
       SETARG_A(*pc, reg);
@@ -537,12 +551,18 @@ int luaK_exp2RK (FuncState *fs, expdesc *e) {
       }
       else break;
     }
-    case VKNUM: {
+    case VKINT: {
+      e->u.info = luaK_intK(fs, e->u.ival);
+      e->k = VK;
+      goto vk;
+    }
+    case VKFLT: {
       e->u.info = luaK_numberK(fs, e->u.nval);
       e->k = VK;
       /* go through */
     }
     case VK: {
+     vk:
       if (e->u.info <= MAXINDEXRK)  /* constant fits in argC? */
         return RKASK(e->u.info);
       else break;
@@ -626,7 +646,7 @@ void luaK_goiftrue (FuncState *fs, expdesc *e) {
       pc = e->u.info;
       break;
     }
-    case VK: case VKNUM: case VTRUE: {
+    case VK: case VKFLT: case VKINT: case VTRUE: {
       pc = NO_JUMP;  /* always true; do nothing */
       break;
     }
@@ -671,7 +691,7 @@ static void codenot (FuncState *fs, expdesc *e) {
       e->k = VTRUE;
       break;
     }
-    case VK: case VKNUM: case VTRUE: {
+    case VK: case VKFLT: case VKINT: case VTRUE: {
       e->k = VFALSE;
       break;
     }
@@ -760,7 +780,7 @@ static void codecomp (FuncState *fs, OpCode op, int cond, expdesc *e1,
 
 void luaK_prefix (FuncState *fs, UnOpr op, expdesc *e, int line) {
   expdesc e2;
-  e2.t = e2.f = NO_JUMP; e2.k = VKNUM; e2.u.nval = 0;
+  e2.t = e2.f = NO_JUMP; e2.k = VKFLT; e2.u.nval = 0;
   switch (op) {
     case OPR_MINUS: {
       if (isnumeral(e))  /* minus constant? */
diff --git a/llex.c b/llex.c
index 3423f86f..bb5f36ab 100644
--- a/llex.c
+++ b/llex.c
@@ -1,5 +1,5 @@
 /*
-** $Id: llex.c,v 2.62 2012/12/05 19:57:00 roberto Exp roberto $
+** $Id: llex.c,v 2.63 2013/03/16 21:10:18 roberto Exp roberto $
 ** Lexical Analyzer
 ** See Copyright Notice in lua.h
 */
@@ -39,7 +39,7 @@ static const char *const luaX_tokens [] = {
     "in", "local", "nil", "not", "or", "repeat",
     "return", "then", "true", "until", "while",
     "..", "...", "==", ">=", "<=", "~=", "::", "<eof>",
-    "<number>", "<name>", "<string>"
+    "<number>", "<number>", "<name>", "<string>"
 };
 
 
@@ -90,9 +90,8 @@ const char *luaX_token2str (LexState *ls, int token) {
 
 static const char *txtToken (LexState *ls, int token) {
   switch (token) {
-    case TK_NAME:
-    case TK_STRING:
-    case TK_NUMBER:
+    case TK_NAME: case TK_STRING:
+    case TK_FLT: case TK_INT:
       save(ls, '\0');
       return luaO_pushfstring(ls->L, LUA_QS, luaZ_buffer(ls->buff));
     default:
@@ -216,7 +215,7 @@ static void trydecpoint (LexState *ls, SemInfo *seminfo) {
   if (!buff2d(ls->buff, &seminfo->r)) {
     /* format error with correct decimal point: no more options */
     buffreplace(ls, ls->decpoint, '.');  /* undo change (for error message) */
-    lexerror(ls, "malformed number", TK_NUMBER);
+    lexerror(ls, "malformed number", TK_FLT);
   }
 }
 
@@ -224,9 +223,10 @@ static void trydecpoint (LexState *ls, SemInfo *seminfo) {
 /* LUA_NUMBER */
 /*
 ** this function is quite liberal in what it accepts, as 'luaO_str2d'
-** will reject ill-formed numerals.
+** will reject ill-formed numerals. 'isf' means the numeral is not
+** an integer (it has a dot or an exponent).
 */
-static void read_numeral (LexState *ls, SemInfo *seminfo) {
+static int read_numeral (LexState *ls, SemInfo *seminfo, int isf) {
   const char *expo = "Ee";
   int first = ls->current;
   lua_assert(lisdigit(ls->current));
@@ -234,16 +234,30 @@ static void read_numeral (LexState *ls, SemInfo *seminfo) {
   if (first == '0' && check_next(ls, "Xx"))  /* hexadecimal? */
     expo = "Pp";
   for (;;) {
-    if (check_next(ls, expo))  /* exponent part? */
+    if (check_next(ls, expo)) {  /* exponent part? */
       check_next(ls, "+-");  /* optional exponent sign */
-    if (lisxdigit(ls->current) || ls->current == '.')
+      isf = 1;
+    }
+    if (lisxdigit(ls->current))
       save_and_next(ls);
-    else  break;
+    else if (ls->current == '.') {
+      save_and_next(ls);
+      isf = 1;
+    }
+    else break;
   }
   save(ls, '\0');
-  buffreplace(ls, '.', ls->decpoint);  /* follow locale for decimal point */
-  if (!buff2d(ls->buff, &seminfo->r))  /* format error? */
-    trydecpoint(ls, seminfo); /* try to update decimal point separator */
+  if (!isf) {
+    if (!luaO_str2int(luaZ_buffer(ls->buff), &seminfo->i))
+      lexerror(ls, "malformed number", TK_INT);
+    return TK_INT;
+  }
+  else {
+    buffreplace(ls, '.', ls->decpoint);  /* follow locale for decimal point */
+    if (!buff2d(ls->buff, &seminfo->r))  /* format error? */
+      trydecpoint(ls, seminfo); /* try to update decimal point separator */
+    return TK_FLT;
+  }
 }
 
 
@@ -472,12 +486,11 @@ static int llex (LexState *ls, SemInfo *seminfo) {
           else return TK_CONCAT;   /* '..' */
         }
         else if (!lisdigit(ls->current)) return '.';
-        /* else go through */
+        else return read_numeral(ls, seminfo, 1);
       }
       case '0': case '1': case '2': case '3': case '4':
       case '5': case '6': case '7': case '8': case '9': {
-        read_numeral(ls, seminfo);
-        return TK_NUMBER;
+        return read_numeral(ls, seminfo, 0);
       }
       case EOZ: {
         return TK_EOS;
diff --git a/llex.h b/llex.h
index 1125e836..14eb548d 100644
--- a/llex.h
+++ b/llex.h
@@ -1,5 +1,5 @@
 /*
-** $Id: llex.h,v 1.71 2011/06/20 16:52:48 roberto Exp roberto $
+** $Id: llex.h,v 1.72 2011/11/30 12:43:51 roberto Exp roberto $
 ** Lexical Analyzer
 ** See Copyright Notice in lua.h
 */
@@ -27,7 +27,7 @@ enum RESERVED {
   TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE,
   /* other terminal symbols */
   TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE, TK_DBCOLON, TK_EOS,
-  TK_NUMBER, TK_NAME, TK_STRING
+  TK_FLT, TK_INT, TK_NAME, TK_STRING
 };
 
 /* number of reserved words */
@@ -36,6 +36,7 @@ enum RESERVED {
 
 typedef union {
   lua_Number r;
+  lua_Integer i;
   TString *ts;
 } SemInfo;  /* semantics information */
 
diff --git a/lobject.c b/lobject.c
index 8bea8972..53de02a0 100644
--- a/lobject.c
+++ b/lobject.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lobject.c,v 2.57 2013/01/29 16:00:40 roberto Exp roberto $
+** $Id: lobject.c,v 2.58 2013/02/20 14:08:56 roberto Exp roberto $
 ** Some generic functions over Lua objects
 ** See Copyright Notice in lua.h
 */
@@ -169,6 +169,25 @@ int luaO_str2d (const char *s, size_t len, lua_Number *result) {
 }
 
 
+int luaO_str2int (const char *s, lua_Integer *result) {
+  lua_Unsigned a = 0;
+  if (s[0] == '0' &&
+      (s[1] == 'x' || s[1] == 'X')) {  /* hexa? */
+    s += 2;  /* skip '0x' */
+    for (; lisxdigit(cast_uchar(*s)); s++)
+      a = a * 16 + luaO_hexavalue(cast_uchar(*s));
+  }
+  else {  /* decimal */
+    for (; lisdigit(cast_uchar(*s)); s++)
+      a = a * 10 + luaO_hexavalue(cast_uchar(*s));
+  }
+  if (*s != '\0') return 0;  /* something wrong in the numeral */
+  else {
+    *result = cast(lua_Integer, a);
+    return 1;
+  }
+}
+
 
 static void pushstr (lua_State *L, const char *str, size_t l) {
   setsvalue2s(L, L->top++, luaS_newlstr(L, str, l));
diff --git a/lobject.h b/lobject.h
index 40977e99..8e7916a1 100644
--- a/lobject.h
+++ b/lobject.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lobject.h,v 2.70 2012/05/11 14:10:50 roberto Exp $
+** $Id: lobject.h,v 2.73 2013/04/15 15:44:46 roberto Exp roberto $
 ** Type definitions for Lua objects
 ** See Copyright Notice in lua.h
 */
@@ -498,6 +498,7 @@ LUAI_FUNC int luaO_fb2int (int x);
 LUAI_FUNC int luaO_ceillog2 (unsigned int x);
 LUAI_FUNC lua_Number luaO_arith (int op, lua_Number v1, lua_Number v2);
 LUAI_FUNC int luaO_str2d (const char *s, size_t len, lua_Number *result);
+LUAI_FUNC int luaO_str2int (const char *s, lua_Integer *result);
 LUAI_FUNC int luaO_hexavalue (int c);
 LUAI_FUNC const char *luaO_pushvfstring (lua_State *L, const char *fmt,
                                                        va_list argp);
diff --git a/lparser.c b/lparser.c
index b83b0c33..0ac318ff 100644
--- a/lparser.c
+++ b/lparser.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lparser.c,v 2.129 2012/08/06 13:36:34 roberto Exp roberto $
+** $Id: lparser.c,v 2.130 2013/02/06 13:37:39 roberto Exp roberto $
 ** Lua Parser
 ** See Copyright Notice in lua.h
 */
@@ -935,14 +935,19 @@ static void suffixedexp (LexState *ls, expdesc *v) {
 
 
 static void simpleexp (LexState *ls, expdesc *v) {
-  /* simpleexp -> NUMBER | STRING | NIL | TRUE | FALSE | ... |
+  /* simpleexp -> FLT | INT | STRING | NIL | TRUE | FALSE | ... |
                   constructor | FUNCTION body | suffixedexp */
   switch (ls->t.token) {
-    case TK_NUMBER: {
-      init_exp(v, VKNUM, 0);
+    case TK_FLT: {
+      init_exp(v, VKFLT, 0);
       v->u.nval = ls->t.seminfo.r;
       break;
     }
+    case TK_INT: {
+      init_exp(v, VKINT, 0);
+      v->u.ival = ls->t.seminfo.i;
+      break;
+    }
     case TK_STRING: {
       codestring(ls, v, ls->t.seminfo.ts);
       break;
diff --git a/lparser.h b/lparser.h
index 33257932..41f3c42b 100644
--- a/lparser.h
+++ b/lparser.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lparser.h,v 1.69 2011/07/27 18:09:01 roberto Exp roberto $
+** $Id: lparser.h,v 1.70 2012/05/08 13:53:33 roberto Exp roberto $
 ** Lua Parser
 ** See Copyright Notice in lua.h
 */
@@ -22,7 +22,8 @@ typedef enum {
   VTRUE,
   VFALSE,
   VK,		/* info = index of constant in `k' */
-  VKNUM,	/* nval = numerical value */
+  VKFLT,	/* nval = numerical float value */
+  VKINT,	/* nval = numerical integer value */
   VNONRELOC,	/* info = result register */
   VLOCAL,	/* info = local register */
   VUPVAL,       /* info = index of upvalue in 'upvalues' */
@@ -46,7 +47,8 @@ typedef struct expdesc {
       lu_byte vt;  /* whether 't' is register (VLOCAL) or upvalue (VUPVAL) */
     } ind;
     int info;  /* for generic use */
-    lua_Number nval;  /* for VKNUM */
+    lua_Number nval;  /* for VKFLT */
+    lua_Integer ival;    /* for VKINT */
   } u;
   int t;  /* patch list of `exit when true' */
   int f;  /* patch list of `exit when false' */