Undefined Variable Inside Asyncblock

[KelsenH]

Variables that are defined before asyncblock are undefined when referenced inside of asyncblock
Does not appear to occur for string values, but does for objects

E.G.

var func = function (args, callback) {
  var foo = args.foo;

  asyncblock (function*(){
    console.log(foo) //prints undefined
    console.log(args.foo) //prints value of foo
  },callback)
}