Treesheets had this for over 15 years now. <a href="https://strlen.com/treesheets/" rel="nofollow">https://strlen.com/treesheets/
I guess “so nothing”. The model is fundamentally broken. Adding a third dimension to certain cells by giving them a new type (‘tuple’, ‘list’?) whilst also having multiple sheets that aren’t (really) addressable is a disaster for the semantics.
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