read should indicate whether the "last" parent was found

[phillipskevin]

reading foo.bar.zed from

{
    foo: {bar: {zed: undefined}}
}

should give {parent: foo.bar, parentKeyKey: true, value: undefined, foundLastParent: true}.

But reading from

{
    foo: { bar: undefined }
}

should give {parent: foo, parentHasKey: true, value: undefined, foundLastParent: false}.