code: func Open(l *lua.State) {
  	urlOpen := func(l *lua.State) int {
  		lua.NewLibrary(l, urlLibrary)
  		return 1
  	}
  	lua.Require(l, "goluago/net/url", urlOpen, false)
  	l.Pop(1)
  }
docs: // Open makes part of the Go net/url package available to Lua code executing
  // in the given lua.State, provided that it requires it:
  //    local url = require("goluago/net/url")