I'm interested in that too! I want to be able to decouple the 'declarative structure' of my data from its concrete representation in memory.
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You might find this post interesting. It's about representation polymorphism in Perl 6 - not sure what Raku does these days though:
There was also this paper: “You can have it all: abstraction and good cache performance” dl.acm.org/doi/10.1145/31 which talks abstracting over struct of arrays (SoA) vs array of structs (AoS) representations.
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There was also a follow up paper by the same group which seemed interesting: “Reshape your layouts, not your programs: A safe language extension for better cache locality”
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In Raku the representation (memory layout) and the meta-object (how do I dispatch methods, type check, etc.) have remained distinct. So one can write a `class` and choose for it to have memory layout like a C struct or union, for example, but it'll otherwise work the same.
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