How to make tinymce paste in plain text by default

For the tinyMCE 3X or 4X things have change a little. now you can do this and it works fine.

tinymce.init({
    plugins: "paste",
    paste_as_text: true
});

I have solved this problem with this code

tinyMCE.init({
...
plugins : "paste",
paste_text_sticky : true,
setup : function(ed) {
    ed.onInit.add(function(ed) {
      ed.pasteAsPlainText = true;
    });
  }
....
})