marshal fails on null values

[yusefnapora]

Trying to marshal an object that contains a null value results in a TypeError:

ipld.marshal({foo: null})

TypeError: Cannot convert undefined or null to object
    at transform (/Users/yusef/Work/Code/aleph/node_modules/ipld/lib/cbor.js:24:23)
    at /Users/yusef/Work/Code/aleph/node_modules/ipld/lib/cbor.js:29:20
    at Array.forEach (native)
    at transform (/Users/yusef/Work/Code/aleph/node_modules/ipld/lib/cbor.js:27:10)
    at Object.exports.marshal (/Users/yusef/Work/Code/aleph/node_modules/ipld/lib/cbor.js:55:22)
    at repl:1:-56
    at ContextifyScript.Script.runInThisContext (vm.js:25:33)
    at Object.exports.runInThisContext (vm.js:77:17)
    at _eval (/Users/yusef/Work/Code/aleph/node_modules/babel-cli/lib/_babel-node.js:103:23)
    at REPLServer.replEval (/Users/yusef/Work/Code/aleph/node_modules/babel-cli/lib/_babel-node.js:185:14)

This can be fixed by adding a null check to the transform function in cbor.js

  function transform (obj) {
    if (obj === null || obj === undefined) return obj
   // ...
  }

This is apparently because javascript thinks typeof null === 'object' 😝