When running ESLint over the whole of data/binaries/ with eslint.json reduced to just these new keys, it finds zero existing violations of this rule.

I did not verify this, but from my experience you are accurate about these things.

Usually I would say its best to minimize bureucracy, and go through all options for once and for all so that we don't have a neverending list of small steps.
At least if the scope is managable.
I remember going through that list of options once, when the first version of the file was committed: rP20364 / D213.
Then again I don't mind putting an end to this patch now by committing it.

Yes I fully agree with banning whitespace that isnt space, tab or newline.

Yes I see that arguments.callee is already illegal in ES5 strict mode:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/arguments/callee

https://eslint.org/docs/rules/no-caller

This rule was introduced in ESLint 0.0.6.

https://eslint.org/docs/rules/no-irregular-whitespace

This rule was introduced in ESLint 0.9.0.

It looks like these options aren't new either:
https://github.com/eslint/eslint/releases?after=v5.12.1

So it seems like in the original review I only checked for correctness, but not compelteness.
So basically if we wanted to be complete, one can look at all the other options, meh.

Thanks for the patch Krinkle!