produceWithPatches doesn't collapse Immutable<Immutable<T>> into Immutable<T>

[adamsmasher]

🐛 Bug Report

I'm using produceWithPatches to update my otherwise immutable state with underlying type T, which I store as a field in a class. I want my class to be generic.

Since produceWithPatches gives me back an Immutable<T>, I also need to make that field of type Immutable<T>, so that
I can assign the result to it.

But this means that when I pass that data into produceWithPatches, it's of type Immutable<T>, which means produceWithPatches gives me back an Immutable<Immutable<T>>, which can't be assigned back to the original data.

Of course, I can cast around this, but ideally casting shouldn't be necessary.

Since this is related to the return type of produceWithPatches, it seems related to #850.

Apologies if I'm missing something here. Thanks!

Link to repro

https://codesandbox.io/s/immutable-immutable-t-rbmvq

Observed behavior

produceWithPatches generates an Immutable<Immutable<T>> when given an Immutable<T>.

Expected behavior

produceWithPatches generates an Immutable<T> when given an Immutable<T>

Environment

• Immer version: 9.0.7
• I filed this report against the latest version of Immer
• Occurs with setUseProxies(true)
• Occurs with setUseProxies(false) (ES5 only)

[adamsmasher]

This appears to be fixed now?