Convention for Arrays With a Single Item

[benjamin-kirkbride]

Currently, it's only possible to create an array by having multiple elements with the same name appear. This is problematic if you want a array that can have a single item.

I would propose a naming convention that ensures this.

For instance: name="foo.[bar]" or perhaps name="foo._bar_" would create the object {"foo": {"bar": []}}

I can make a PR for this, shouldn't be a huge lift at all. The purpose of this issue is mostly to see what your thoughts are.