Number fixes.

(1) Change how LDouble computes hashCode to match standard Lua.
(2) Change how toJavaString deals with NaN, infinity, and -0.
(3) Move 0 * -2 case to end of mathlib test case so that problematic tests
    are towards the end.

src/core/org/luaj/vm/LDouble.java

@@ -35,14 +35,23 @@ public class LDouble extends LNumber {
 	}
     
 	public int hashCode() {
-		return (int) m_value;
+		if ( m_value == 0 ) {
+			return 0;
+		} else {
+			long bits = Double.doubleToLongBits( m_value );
+			return ( (int) bits >> 32 ) + ( (int) bits );
+		}
 	}
 	
 	public String toJavaString() {
 		if ( Double.isNaN(m_value) )
-			return "-1.#IND";
+			return "nan";
 		if ( Double.isInfinite(m_value) )
-			return (m_value>0? "1.#INF": "-1.#INF");		
+			return (m_value>0? "inf": "-inf");
+		if ( m_value == 0.0 ) {
+			long bits = Double.doubleToLongBits( m_value );
+			return ( bits >> 63 == 0 ) ? "0" : "-0";
+		}
 		long l = (long) m_value;
 		if ( (m_value == (double) l) && (m_value <= Long.MAX_VALUE) && (m_value >= Long.MIN_VALUE) ) {
 			return Long.toString( l );

src/test/res/mathlib.lua

@@ -17,7 +17,6 @@ function binops( a, b )
 	return '--' 
 end
 print( pcall( binops, 2, 0 ) )
-print( pcall( binops, -2, 0 ) )
 print( pcall( binops, 2.5, 0 ) )
 print( pcall( binops, -2.5, 0 ) )
 print( pcall( binops, 2, 1 ) )
@@ -41,9 +40,10 @@ print( pcall( binops, 2.25, 0 ) )
 print( pcall( binops, 2.25, 2 ) )
 print( pcall( binops, 2.25, .5 ) )
 print( pcall( binops, 2.25, 2.5 ) )
-
+print( pcall( binops, -2, 0 ) )
 
 -- random tests
+print("Random tests")
 print( math.random(5,10) )
 print( math.random(5,10) )
 print( math.random(5,10) )