java.math.BigDecimal.movePointLeft() should return this if called with zero argument

A DESCRIPTION OF THE REQUEST :
BigDecimal.movePointLeft(int n) does not check if it is called with a zero argument, and will unnecessarily create a copy of the receiver, instead of returning this.

JUSTIFICATION :
Programmers who want to avoid unnecessary object creation now have to add additional branching:

return (scale>0)? b.movePointLeft(scale):b;

after the fix, this becomes

return b.movePointLeft(scale);

 


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
BigDecimal.movePointLeft(int n), when called with an argument of zero, should return the receiver.
ACTUAL -
BigDecimal.movePointLeft(int n), when called with an argument of zero, currently instantiates a copy of the receiver.


---------- BEGIN SOURCE ----------
   
 @Test
    public void createsNewInstance() {

        BigDecimal receiver = new BigDecimal("123.45");
        BigDecimal result = receiver.movePointLeft(0);

        assertNotSame(receiver, result);
    }

---------- END SOURCE ----------