`allowEmptyArrays` option disrespects `arrayFormat`

[cdpark0530]

allowEmptyArrays option was intruduced in version 6.12.0

• [New] parse/stringify: add allowEmptyArrays option to allow [] in object values #487

Without this option

qs.stringify({ foo: [], bar: baz })
// 'bar=baz'

With this option

qs.stringify({ foo: [], bar: baz }, { allowEmptyArrays: true })
// 'foo[]&bar=baz'

However, I believe that with arrayFormat: 'comma' option, it should result like this:

qs.stringify({ foo: [], bar: baz }, { allowEmptyArrays: true, arrayFormat: 'comma' })
// 'foo=&bar=baz'

[ljharb]

I understand that expectation, but when commaRoundTrip is anything but true, comma does a bunch of weird stuff, and when commaRoundTrip is true, i think 'foo[]&bar=baz' would be the expected output?