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Pretty much something like @const but reactive is what I'm looking for.

Good call but I would like to prevent cluttering my data with some UI state. Interesting to hear that you think having block scoped state is too niche for a new concept. I find myself needing this quite often, e.g. for a loading state in an each block. Smth like {@let ...} would be quite helpful.

This is probably the best approach as of now. Although it feels a bit cumbersome to add a component for these usually tiny and specific use cases.