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Returns the unit in the last place (ULP) of this BigDecimal instance. An ULP is the distance to the nearest big decimal with the same precision.
The amount of a rounding error in the evaluation of a floating-point operation is often expressed in ULPs. An error of 1 ULP is often seen as a tolerable error.
For class BigDecimal, the ULP of a number is simply 10-scale. For example, new BigDecimal(0.1).ulp() returns 1E-55.