return 0, false
			}
		}
		return value, true
	}
}

// negativeScaleInt64 reduces base by the provided scale, rounding up, until the
// value is zero or the scale is reached. Passing a negative scale is undefined.
// The value returned, if not exact, is rounded away from zero.
func negativeScaleInt64(base int64, scale Scale) (result int64, exact bool) {
	if scale == 0 {
		return base, true
	}

// return 1, because 0.000001 is rounded up to 1.
func (a int64Amount) AsScaledInt64(scale Scale) (result int64, ok bool) {
	if a.scale < scale {
		result, _ = negativeScaleInt64(a.value, scale-a.scale)
		return result, true
	}
	return positiveScaleInt64(a.value, a.scale-scale)
}

// AsDec returns an inf.Dec representation of this value.
func (a int64Amount) AsDec() *inf.Dec {

		{-1000, 4, -1, false},

		{0, 0, 0, true},
		{0, 1, 0, true},
		{0, 2, 0, true},

		// negative scale is undefined behavior
		{1000, -1, 1000, true},
	} {
		result, exact := negativeScaleInt64(test.base, test.scale)
		if result != test.result {
			t.Errorf("%v: unexpected result: %d", test, result)
		}
		if exact != test.exact {
			t.Errorf("%v: unexpected exact: %t", test, exact)
		}
	}