[WIP] Linearization without conversion #147433
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This work in progress PR combines
It is a large change.. there are some small parts I can easily disentangle from the bulk of this PR and post as initial PRs, but then it will get a bit trickier, because the change from type conversion to rewrite patterns cannot be done gradually. It could be more gradually than this PR though for sure, by focusing just on 1 above.
Anyway, posting this to hopefully get some initial high-level thoughts