Convert return value of luaLength to be int

src/addon/java/lua/addon/luacompat/LuaCompat.java

@@ -585,7 +585,7 @@ public class LuaCompat extends LFunction {
 		if ( i == 0 )
 			i = 1;
 		if ( j == 0 )
-			j = list.luaLength().luaAsInt();
+			j = list.luaLength();
 		vm.setResult();
 		for ( int k=i; k<=j; k++ ) 
 			vm.push( list.get(k) );

src/main/java/lua/value/LString.java

@@ -290,8 +290,8 @@ public class LString extends LValue {
 	}
 	
 	/** Built-in opcode LEN, for Strings and Tables */
-	public LValue luaLength() {
-		return LInteger.valueOf( length() );
+	public int luaLength() {
+		return m_length;
 	}
 
 	public int luaGetType() {

src/main/java/lua/value/LTable.java

@@ -235,14 +235,14 @@ public class LTable extends LValue {
 	 * as the C version in all cases, but that's ok because the length operation
 	 * on a table where the integer keys are sparse is vaguely defined.
 	 */
-	public LValue luaLength() {
+	public int luaLength() {
 		for ( int i = Math.max( 0, m_arrayEntries-1 ); i < m_vector.length; ++i ) {
 			if ( m_vector[i] != LNil.NIL &&
 					( i+1 == m_vector.length || m_vector[i+1] == LNil.NIL ) ) {
-				return LInteger.valueOf( i+1 );
+				return i+1;
 			}
 		}
-		return LInteger.valueOf( 0 );
+		return 0;
 	}
 	
 	/** Valid for tables */

src/main/java/lua/value/LValue.java

@@ -146,9 +146,10 @@ public class LValue {
 	}
 
 	/** Built-in opcode LEN, for Strings and Tables */
-	public LValue luaLength() {
+	public int luaLength() {
 		// TODO: call meta-method TM_LEN here
-		return luaUnsupportedOperation();
+		luaUnsupportedOperation();
+		return 0;
 	}
 
 	/** Valid for tables