Support custom specifications

[ricmoo]

Working with Ethereum I needed to add my own custom specifications. I currently do this by copying an existing entries from IBAN.countries to hijack, and replace all the values within it.

Ideally I would like IBAN.Specification exposed as well as the second parameter to use a passed in Specification instead of a country code for IBAN.fromBBAN.

I can make a pull request if you are interested. It is fully backward compatible. Thanks.

[itoche]

Hi,
May I ask why you need that level flexibility?
Feel free to propose a pull request, thanks.

[ricmoo]

Heya @itoche,

The Ethereum project uses the IBAN standard as part of their ICAP address checksumming scheme, but is obviously not a "real" entity that would otherwise belong in the default IBAN.countries, and I'd rather build off of an existing library than just copy it.

Moreover, they require additional logic, since their XE "country code" allows either 30 byte or 32 byte base32 encoded addresses. I'll put up a simple library this weekend using the current iban.js (with my hijacking hackery) as well as a send a pull request to expose the functionality to remove said hackery. :)

[Moejoe90]

@ricmoo why not add the ethereum spec as PR? instead of pushing for custom pr options i think it would be easier to implement i don't there are any other use cases for this

[ricmoo]

At the time I brought this up, no one had heard of Ethereum, it was brand new, just launched, so asking a library that supports countries to add a new “thing” like a “crazy internet money that can do math too” as a country seemed unlikely to be accepted. :)

That said, now I feel I could certainly add it. I’ve in the meantime wrote my own, but it would be good for community to have it in this library too.