Can we get a fix in the Change Streams generation engine generate updatedFields that are NOT dot-notated?

For instance, instead of

updatedFields: { 'device.temperature': 70}

it would be nice if we could decompose the dot-notated 'device.temperature' string into:

updatedFields: { device: {temperature: 70}}

This is related to SERVER-21889.

I know this might affect the performance of change streams but without that improvement, the use of change streams might turn out to be limited (and restricted to inserts and top-level attributes updates)