`behaviour` doesn't follow American spelling standards about remark-autolink-headings

[wooorm]

I personally prefer British spelling, and use that in documentation. I do use US spelling for code though. Above all consistency is most important. The reason for this API case is that this library was originally authored by a UK citizen.

I think behavior would be better here. Although I’m very much against unneeded breaking changes, we can:

• Update the docs to use behavior
• Update the code to use behavior but fall back to behaviour if behavior is not given
• Cut a minor release

[missmatsuko]

Agreed! I can work on this, if you'd like.

Should we also add some kind of warning when behaviour is used?
If so, is console.warn(someMessage) sufficient? I don't know what's standard.

[ChristianMurphy]

Sounds good, Node does something similar (docs and source)
console.warn looks like a nice, light weight approach 👍 (browser compatibility)

[Murderlon]

As far as I know the remark ecosystem leans towards American spelling but at this point I don't think it's worth a breaking change on its own.

[wooorm]

Console.warn is nice enough but I'd still be slightly annoyed by those appearing from a minor update?
I would Def be for a comment that says something like 'remove next major'.

But I'm up for what everyone else things, no strong feelings!