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Comment by forlorn | Hacker News Reader

  op describe {name, role} (
    print "user: " + name + " (" + role + ")";
  )

Strange choice of brackets usage

But then the call makes more sense: `describe {role: "admin", name: "alice"};`

Precisely! Call sites should be traditional syntax shaped, pos args get [ and ] (trad array), and object shapes get trad obj syntax.