Re: [whatwg/url] remaining variable ambiguity (#308)

All your mentioned cases are the access of _c_ when _pointer_ is out-of-bounds. The behaviour is described for lists here: https://infra.spec.whatwg.org/#list

> An indexing syntax can be used by providing a zero-based index into a list inside square brackets. The index cannot be out-of-bounds, except when used with exists.

I think the same must be defined for strings with only **EOF code point** exception (when _pointer_ = string._length_). So any attempt to access _c_ then _pointer_ is out-of-bounds (_pointer_ < 0 or _pointer_ > string._length_), must be considered a bug.

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