bug when using array and object under a key

[mehimanshupatil]

as mentioned in #7
This triggers TypeError:

test[0]=haha
test[0].ohno=oops

This silently eats the first value:

test[0]=haha
test.ohno=oops

gives:

  "test": {
    "ohno": "oops"
  }

whereas ideally it'd give:

  "test": {
    "0": "haha",
    "ohno": "oops"
  }