Type coercion for luajava package, make luajava an "addon"

src/main/java/lua/value/LDouble.java

@@ -40,7 +40,7 @@ public class LDouble extends LNumber {
 		case Lua.OP_MUL: return new LDouble( lhs * rhs );
 		case Lua.OP_DIV: return new LDouble( lhs / rhs );
 		case Lua.OP_MOD: return new LDouble( lhs % rhs );
-		case Lua.OP_POW: return new LDouble( Math.pow(lhs, rhs) );
+//		case Lua.OP_POW: return new LDouble( Math.pow(lhs, rhs) );
 		}
 		return luaUnsupportedOperation();
 	}
@@ -49,6 +49,10 @@ public class LDouble extends LNumber {
 		return (int) m_value;
 	}
 
+	public double luaAsDouble() {
+		return m_value;
+	}
+
 	// binary compares on integers, first dispatch
 	public boolean luaBinCmpUnknown(int opcode, LValue lhs) {
 		return lhs.luaBinCmpDouble( opcode, this.m_value );

src/main/java/lua/value/LInteger.java

@@ -35,7 +35,7 @@ public class LInteger extends LNumber {
 		case Lua.OP_MUL: return new LInteger( m_value * rhs );
 		case Lua.OP_DIV: return new LInteger( m_value / rhs );
 		case Lua.OP_MOD: return new LInteger( m_value % rhs );
-		case Lua.OP_POW: return new LInteger( (int) Math.pow(m_value, rhs) );
+//		case Lua.OP_POW: return new LInteger( (int) Math.pow(m_value, rhs) );
 		}
 		return luaUnsupportedOperation();
 	}

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

@@ -6,17 +6,23 @@ import lua.StackState;
 public class LString extends LValue {
 
 	final String m_string;
+	final int m_hash;
 	
 	public LString(String string) {
 		this.m_string = string;
+		this.m_hash = string.hashCode();
 	}
 
 	public boolean equals(Object o) {
-		return o != null && o instanceof LString && m_string.equals(((LString)o).m_string);
+		if ( o != null && o instanceof LString ) {
+			LString s = (LString) o;
+			return m_hash == s.m_hash && m_string.equals(s.m_string);
+		}
+		return false;
 	}
 
 	public int hashCode() {
-		return m_string.hashCode();
+		return m_hash;
 	}
 
 	// TODO: what to do with LuaState? 

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

@@ -7,7 +7,7 @@ abstract
 public class LValue {
 
 	protected static LValue luaUnsupportedOperation() {
-		throw new java.lang.UnsupportedOperationException();
+		throw new java.lang.RuntimeException( "not supported" );
 	}
 
 	public String id() {
@@ -106,6 +106,11 @@ public class LValue {
 		return 0;
 	}
 
+	/** Return value as a double */
+	public double luaAsDouble() {
+		return luaAsInt();
+	}
+
 	/** Arithmetic negative */
 	public LValue luaUnaryMinus() {
 		return luaUnsupportedOperation();