throw Error for ISO search

[triori]

Hi there, My point if you return null in other case, why you throw new Error in ISO case? throw new Error('cannot determine ISO code type') in ISO case VS return null for other cases. I think it is unexpectable result, isn't it?

[richorama]

I agree that there is some inconsistency here, but the error indicates that the input format is possibly wrong, the other indicates that there isn't a match (another way for the input being wrong I suppose).

Happy to change this behaviour with an update to the major version number to represent a change in the API

[jjsimps]

At minimum I think that the behavior should be documented. Especially if you stick to throwing an Error.