Re: [whatwg/url] Percent-decode more stuff? (#87)

It seems we avoid most issues here by simply not percent-decoding (other than host, where a one-time decode pass followed by IDNA is fine as it will return failure if anything fails).

My conclusion here is to embrace the suggestion in https://github.com/whatwg/url/issues/87#issuecomment-256124153 to only work with double-dot path segments and single-dot path segments and not decode %2e generally (or anything else).

We need to make sure that is covered by the testsuite.

Gecko will need to WONTFIX https://bugzilla.mozilla.org/show_bug.cgi?id=1197123 (action item for @valenting I think).

Chrome and Edge will have to change their behavior. I think in the end that will turn out to be a drastic code simplification for them since they no longer have to worry about cases such as `%%300`.

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