MonetaryAmount.stripTrailingZeros() is confusing #114

javax.money.MonetaryAmount#stripTrailingZeros() is confusing for two reasons:

• It seems to be the only method left on MonetaryAmount that operates on the number value. #getAmountWhole() has been removed and #getAmountFractionNumerator() and #getAmountFractionDenominator() have been moved to javax.money.NumberValue.
• It assumes the implementation has an adjustable scale like BigDecimal/org.javamoney.moneta.Money. It is unspecified that should happen in cases where the scale is fixed like for org.javamoney.moneta.FastMoney.

It could either be moved to javax.money.NumberValue like #getAmountFractionNumerator() and #getAmountFractionDenominator() or a user could simply do

money.getFactory()
        .setNumber(money.getNumber().numberValueExact(BigDecimal.class).stripTrailingZeros())
        .create();