I wrote:
> ToArrayLength(V)
> 
>  1. Call ToNumber(V).
>  2. If Result(1) is not a nonnegative integer less than or equal to
>     ArrayLengthLimit, then throw a RangeError.

"... then throw a RangeError exception."

[...]
> The resulting 'concat', 'push', and 'unshift' methods can throw a
> RangeError because the length of the array they create would be
> greater than ArrayLengthLimit; the others (excluding 'splice') can
> only throw a RangeError when they operate on an object that is not
> a native array and has an invalid length property.

... will only throw a RangeError from ToArrayLength ...
(It is possible that something else they call may throw a RangeError.)

-- 
David-Sarah Hopwood
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