Bug in some cases of URLSearchParams percent decoding

[zloirock]

[...new URLSearchParams('?%C2').keys()][0];
[...new URLSearchParams('?%C2x').keys()][0];
[...new URLSearchParams('?%FE%FF').keys()][0];
[...new URLSearchParams('?%FF%FE').keys()][0];

Thanks @mhassan1 for pointing it.

It's too simplified.