Key chaining before defining full object

[JakeStanger]

The spec currently specifies that key-chaining can be mixed with full-object representation:

specification/spec.md

Lines 409 to 419 in b5084cb

	The 'standard' nested object syntax can be mixed with key chaining:
	```corn
	{
	foo = {
	bar = 42
	}
	foo.pi = 3.14
	}
	```

What is not specified is whether this should be supported in reverse, ie chaining prior to the full-object.

{
    value.foo = 42
    value = { bar = 3.14 }
}

https://github.com/corn-config/test-suite/blob/0a493cedc8f0039bc9a0aceeb6a3c66ba0024bce/corn/key/chaining/start.pos.corn

The current (v0.10) behaviour is that foo is overwritten and lost.

{ "value": { "bar": 3.14 } }

https://github.com/corn-config/test-suite/blob/0a493cedc8f0039bc9a0aceeb6a3c66ba0024bce/json/key/chaining/start.json

Should this be the the case, or should the expected result be an object with both foo and bar?

A decision is required, and the spec needs to be updated either way.