Hello!

Issue
I'm struggling to mutate an object as i need to split it and then add different things to each new end. The problem is that the original object has nested objects, so when duplicating, the original nested objects get referenced.

Lets say i have

const a = {b: 0}

And then i split a to:

a => [a1, a2]
a1 => {b:0}
a2 => {b:0}

if i do this in the same draft and i modify b:2 it affects both.

I'm trying to sue structuredClone, structuredClone(current(a)) but they don't work because the draft are embeded.

With some real data:

subNode {
      '$thing': 'User',
      '$thingType': 'entity',
      '$op': 'update',
      '$bzId': 'R_9b59cc31-9df8-44ad-9dc2-839108f3f116',
      '$entity': 'User',
      '$id': <ref *1> [....} ],
      spaces: <ref *2> [
        {
          type_: 1,
          scope_: [Object],
          modified_: false,
          finalized_: false,
          assigned_: {},
          parent_: [Object],
          base_: [Array],
          draft_: [Circular *2],
          copy_: null,
          revoke_: [Function (anonymous)],
          isManual_: false
        }
      ]
    }

Basically I split the original object which has $id: ['id1' ,'id2'] into an array with two objects.

	return subNode.$id.map(($id: string, i: number) => ({
      ...subNode,
      $id: $id,
      $bzId: `${subNode.$bzId}_${i}`,
   }));

This works at the root node, i get an array with two different BzId "_0" and "_1"
But if i modify the nested object, it gets modified in both places.

I tried to use this: ...structuredClone(subNode),

But it gets this error: [object Array] could not be cloned.
I guess this happens when it arrives to the nested structures created by immer.

Is there a way in immer to deeply clone an object and drop?

or the only way i can do right is a deepCurrent() and then use structureCloned over the result?

Immer version:
Using immer (9.0.21 as 10.0.x does not work with symbols that have references to objects)