new URLSearchParams([[key1, val1], [key2, val2]]) is not working

[caub]

new url.URLSearchParams([['param1', 'val1'], ['...', '...']])+'';

This should output "param1=val1&...=..."

But it outputs 'param1%2Cval1%2C...%2C...='

The spec describes it here https://url.spec.whatwg.org/#urlsearchparams, the constructor should accept either a query-string, array of [key, value]'s or plain-object

Node version tested 7.9.0

[TimothyGu]

This issue can be considered to be a duplicate of #10635. Node.js master branch has supported this feature since Jan 31 (#11060), and v7.10.0 will be released with that commit (backport PR #12507). The feature was held back from landing in any v7.x releases because of potential future changes in the constructor (whatwg/url#204), but as that cause was stalled I have landed it in v7.x just recently.