'Returns a copy of the decimal object.
>>> ExtendedContext.copy_decimal(Decimal(\'2.1\'))
Decimal(\'2.1\')
>>> ExtendedContext.copy_decimal(Decimal(\'-1.00\'))
Decimal(\'-1.00\')
>>> ExtendedContext.copy_decimal(1)
Decimal(\'1\')'

def copy_decimal(self, a):

    a = _convert_other(a, raiseit=True)
    return Decimal(a)
