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It's great you've noticed immutability in a singled threaded environment is a nonsense. Why to go further with own implementation then?

Pure functions are great, regardless of threading / concurrency problems.

I know you don't _need_ immutability enforced at the object level to write pure functions, but I could understand the argument in its favor.

Immutability is highly useful in a browser environment for efficient rendering of UI.

So in order to mutate DOM and present mutable state, you think you need to introduce immutability in the middle? Someone mislead you.