dflow exports a fun function ☺

It has the following signature.

 * Create a dflow function.
 * @param {Object} graph to be executed
 * @param {Object} [additionalFunctions] is a collection of functions
 * @returns {Function} dflowFun that executes the given graph

dflow.fun(graph) returns a dflowFun function which has also a graph property, to remember that it is a function generated by dflow.

Actually dflow exposes also the following functions, available only inside a dflow graph: