?ids[]=1&ids[]=2

import qs
import gleam/dict

"?color=red&tags[]=large&tags[]=wool"
|> qs.parse

> Ok([ #("color", qs.One("red")), #("tags", qs.Many(["large", "wool"])) ] |> dict.from_list)

import qs
import gleam/dict

let query = [
    #("a", qs.One("1")),
    #("b", qs.Many(["2", "3"]))
  ]
  |> dict.from_list

qs.serialize(query)

> "?a=1&b[]=2&b[]=3"