Re: [whatwg/url] Consider percent-encoding more characters in "fragment state" (#344)

Yes, I'm pretty worried about `'?'` there in compat terms, esp given it being explicitly called out as allowed in the RFC.  Actually somewhat worried about `'#'` and `'{'` and `'}'` too, if no one escapes those right now...  How many people pass JSON in fragments, for example?

The actual set of chars the RFC allows in fragments, just for reference, is:

      fragment    = *( pchar / "/" / "?" )

where `pchar` is the set of characters allowed in path segments.  So basically, "everything allowed in paths, plus '?'".  Which is definitely more restrictive than what UAs do.



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