Allow numeric code

[kunicmarko20]

This is one way of doing it, an alternative would be providing new "Currencies" class that can handle both and deprecating this one, but since this is not a BC Break I don't think that is needed.

[kunicmarko20]

If this gets accepted, the only other thing I would propose is adding alphabeticCodeFor since there is numericCodeFor

[kunicmarko20]

@frederikbosch is there any chance to get some feedback on this and maybe include it into the next release?

[frederikbosch]

It might be included in the next release feature release (3.3.x), not in the proposed 3.2.1.

@sagikazarmark What do you think of this feature? Basically the wish is to use numeric codes as Currency, like below.

$currencies = new ISOCurrencies();
$money = new Money(100, new Currency(123));
$currencies->contains($money->getCurrency()); // also checks against numeric code

Right @kunicmarko20?

If we want to have this feature, should we change the code of ISOCurrencies or should there be a new NumericISOCurrencies class? My feeling is that the latter is a better solution.

[kunicmarko20]

The ideal thing would be to support both numeric and alphanumeric and not separately. That is why I provided it this way, and left the initial comment as an alternative would be providing new "Currencies" class that can handle both since the numeric is also part of the ISO.