Uri.ParamsSourceURI fragment or query parameters.
Params.t values represent key-value parameters stored in strings as "k0=v0&k1=v1...". They can be constructed from any Jstr.t. In particular it means they can be used with an URI fragment or query.
The type for URLSearchParams objects.
find k ps is the value of the first binding of k in ps.
find_all k ps are the values of all bindings of k in ps.
fold f ps acc folds all the key value bindings.