4

It seems that Solidity can only handle mappings to elementary data types or structs. Is there some mapping that can handle arbitrary (dynamic) types for the values? Something like:

mapping(string => any) foo;

I have no clue how this would work.

2

You can map to a struct which could be designed to suit your purpose, e.g,

struct MyType {
    uint someInt;
    bytes[] someBytes;
    ...
}

mapping (string => MyType) foo;

But if you mean any to simply be untyped, then no you can't do that. You could perhaps use a bytes[] array and run the element through some manual type conversion functions which sounds much more complicated than simply designing your contract around strict types.

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