Add Money#to_nearest_cash_value
to return a rounded Money instance to the smallest denomination
#1146
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This new method allows you to get a new Money instance rounded to the smallest denomination.
Closes #1130
Allows us to simplify:
to:
Ideally the
#round_to_nearest_cash_value
should have always returned an instance to act like the#round
method. Introducing a new method avoids breaking previous code.