code: public static void setMinimumFractionDigits (@Nullable final ECurrency eCurrency, @Nonnegative final int nDecimals)
    {
      getSettings (eCurrency).setMinimumFractionDigits (nDecimals);
    }
docs: Set the minimum fraction digits to be used for formatting. Applies to the
  currency-formatting and the value-formatting.
  
  @param eCurrency
  The currency it is about. If <code>null</code> is provided
  {@link #DEFAULT_CURRENCY} is used instead.
  @param nDecimals
  The new minimum fraction digits. May not be negative.