def METHOD_NAME(self, lower: int, upper: int, num_vals:int):
    lbl = self.fuzzing_label
    if lower > -1:
        low = lower if lower < lbl.fuzz_maximum + num_vals else lbl.fuzz_maximum - num_vals
        for i in range(low, low + num_vals):
            lbl.add_decimal_fuzz_value(i)
    if upper > -1:
        up = upper if upper < lbl.fuzz_maximum + 1 else lbl.fuzz_maximum - 1
        for i in range(up - num_vals + 1, up + 1):
            lbl.add_decimal_fuzz_value(i)
    self.update()