object entries in structure

[bengreenier]

if we are trying to insert a value, into an object that is already defined, we add a _root: property, and append values to that. in the unlikely case that a _root: property is already set, we go ahead and override it. this is as of v1

[bengreenier]

let's actually go ahead and ignore it instead. This seems like a more stable decision, as the user won't be able to pass arguments that wreck data in a configuration file

however, it doesn't have to be _root, you can specify it by passing a string rootKey: