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

> 
> 
> I'm not sure what you mean?
> 
> ```js
> x = new URLSearchParams("test+test=x+x");
> console.log(x.get("test test")) // "x x"
> ```

Yes! `decodeURIComponent` don't replement `+`. 
I my option, It's just like:
`decodeURIComponent()` = replace `+` | percent decode | UTF-8 decode, 
`URLSearchParams.prototype.toString()` = percent decode | UTF-8 decode
Is there a scenario we prefer `encode/decodeURIComponent` than `URLSearchParams`?

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