Allow for nested params

[smmr0]

Allows passing nested parameters, e.g. a[b][c]=123

See also: kevinsawicki/http-request#147

[silkimen]

There is no standard (RFC spec) defining how to serialize deeply structured objects and arrays to be used for query strings.

// this data:
cons data = {
  a: 1,
  b: 2,
  c: [ 3, 4 ]
};

// can be serialized as:
const option1 = '?data[a]=1&data[b]=2&data[c][0]=3&data[c][1]=4';

// it could also be:
const option2 = '?data[a]=1&data[b]=2&data[c][]=3&data[c][]=4';

// or another one:
const option3 = '?data[a]=1&data[b]=2&data[c]=3&data[c]=4';

// or:
const option4 = '?data.a=1&data.b=2&data.c=3&data.c=4';

// or even:
const option5 = '?data[a]=1&data[b]=2&data[c.0]=3&data[c.1]=4';

It depends on the backend implementation and therefore I prefer to let the application developer do this part. It's up to you to serialize the query parameters before sending the request.