stringify array as comma separated values

Hello there,

it could very nice to have ability to do something like this :

const obj = {foo: [1,2,3]};
queryString.stringify(obj, {arrayFormat: 'comma'})

And the result of this method will be: foo=1,2,3.

[SamVerschueren]

The thing is that every other parser will just parse this as a string. It’s not part of the spec for a very good reason. The other end can’t know if it was meant as one value or as an array of values. foo=hello, sam for instance. What does it mean? Was it meant as aan array? Was it meant just as a string.

[SamVerschueren]

@nsonankar I answered it in https://github.com/sindresorhus/query-string/issues/90#issuecomment-292970631 why it doesn’t make sense to support this.