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Sounds like type-assertions cover that use case just fine. However, you are correct that you can't do this without allocating. ¯\_(ツ)_/¯

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As people keep saying, type assertions do not have as strong compile time assurances as ADTs.

And as I keep saying: I don't value those assurances and in fact find them to be a net loss when accounting for breaking changes changes to clients.

You pay the price of getting the bugs and edge cases out regardless of whether you have compile time assurances.

The complexity is inherent and you can either choose to make it implicit and play the losing game of ensuring it doesn't fail with tests or make it explicit from the outset.

You personally not valuing the differences is very different to not having any differences, and the latter is what a lot of your comments seem to be implying, including the one I was replying to.

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