Document.prototype.$clone()

[vkarpov15]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the feature has not already been requested

🚀 Feature Proposal

doc.$clone() should return a copy of doc with:

1. Deep clone of _doc
2. Deep clone of $__

So return a new doc with the same state (same isNew, populated state, change tracking state, etc.)

Motivation

This has popped up a couple of times in user questions, for example: #10788 . This has also popped up in internal work. Most recently, in #11442 $clone() would have been helpful because we could just create a clone of the document to handle that particular manually populated edge case, so we can ensure that we don't overwrite the document's existing $__.wasPopulated.

Example

No response