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Personally, I would have, since it refers to the Referer header it seems like it should follow the same spelling.

It would be like CSS having a "color" attribute, but then doing something like "default-colour".

Exactly, a Referer on the web is its own thing now. Referrer should be considered a typo if you’re referring to the Referer header.

They are paving a way to release a third spelling in the next update :p

If they just spelled it Refera, they could save another byte.

Reefa

It’s actually more like CSS having a “colr” attribute and then doing something like “default-color”.

I think that depends on whether or not you consider 'color' to be the correct spelling? :)

Guess you're not British then :)