'Return True if the operand is infinite; otherwise return False.
>>> ExtendedContext.is_infinite(Decimal(\'2.50\'))
False
>>> ExtendedContext.is_infinite(Decimal(\'-Inf\'))
True
>>> ExtendedContext.is_infinite(Decimal(\'NaN\'))
False
>>> ExtendedContext.is_infinite(1)
False'

def is_infinite(self, a):

    a = _convert_other(a, raiseit=True)
    return a.is_infinite()
