text: import { Desc } from "./describe";
  import { handleEventValueWith, makeSpawner } from "./flatmap_"
  import Observable from "./observable";
  
  Observable.prototype.flatMap = function() {
    return this.flatMap_(
      handleEventValueWith(makeSpawner(arguments)), 
      { desc: new Desc(this, "flatMap", arguments) }
    );
  };
  