Named arguments / association destructuring beta

foo//es6Decorate
foo[<|
  a_,
  b_Integer,
  "F" -> f_,
  g_:10,
  "J" -> j_:1
|>
]:={a,b,f,g,j}

foo@<|"b"->2,"a"->1,"F"->3|>

{1, 2, 3, 10, 1}