Issue

formatCurrency() does not respect optionalCharacteristic option and chops off leading zero before the decimal point.

See this line.

Input

numbro(-0.004).format({
  output: 'currency',
  currencySymbol: '$',
  currencyPosition: 'prefix',
  mantissa: 2,
  optionalCharacteristic: false
});

Expected output

-$0.00

Actual output

-$.00