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Pass along `textStatus` and `errorThrown`.
Since this is jQuery/ajax specific, I think it's fine to go in the default Backbone.sync. That said, it doesn't fall in the 90% rule and can be done just as easily with a custom wrapper. Either way is fine by me.
If you're passing along the arguments in this way — then how it it not the case that textStatus and errorThrown aren't passed in as arguments directly? Am I reading it wrong?
No, you're correct. It's just that there's a bit of misdirection because error is set up via wrapError, which juggles the arguments before calling through.