in src/util/http.ts [62:71]
function normalize(params: { [key: string]: any }): string[][] {
const list = [];
const flated = flatParams(params);
const keys = Object.keys(flated).sort();
for (const key of keys) {
const value = flated[key];
list.push([encode(key), encode(value)]); // push []
}
return list;
}