centralize type id defs

src/main/java/lua/value/LNumber.java

@@ -5,8 +5,6 @@ import lua.Lua;
 abstract
 public class LNumber extends LValue {
 
-	public static final LString TYPE_NAME = new LString("number");
-	
 	/** Compare for equivalence by using lua op comparator */
 	public boolean equals(Object o) {
 		if ( ! ( o instanceof LValue) )
@@ -15,10 +13,10 @@ public class LNumber extends LValue {
 		return this.luaBinCmpUnknown(Lua.OP_EQ, v );
 	}
 
-	public LString luaGetType() {
-		return TYPE_NAME;
+	public int luaGetType() {
+		return Lua.LUA_TNUMBER;
 	}
-
+	
 	/**
 	 * Returns false by default for non-LNumbers, but subclasses of LNumber must
 	 * override.