Troubles Reading / Writing search params using solid-router useSearchParams()

// for an URL like ?plop=a&plop=b
function MyComponent () {
  const [searchParams, setSearchParams] = useSearchParams()
  console.log(searchParams.plop) // 'b' when I wanted ['a', 'b']
  return (
    <button
      onClick={() => {
        setSearchParams({ pouet: ['a', 'b'] }) // update params like ?plop=a&plop=b&pouet=a%2Cb when I wanted ?plop=a&plop=b&pouet=a&pouet=b
      }}>
      Update search params
    </button>
}