[whatwg/url] the urlencoded spec did not described tuples of which the name includes square brackets (#556)

we use a key-value(tuple) pair which the name end with `[]` to represent a list type in many implementations. 
but the `encodeURIComponent` would decode `[]`to`%5B`and`%5D` just like rfc3986 says.
So I don't know whether it should be standardized or it just depend on server side implementation.

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