How to handle form inputs with multiple values?

[jofas]

I see. You might find the code snippet from this answer a helpful starting point for writing your own deserialization logic:

How to deserialize dotted fields with serde

Here is an allocation-free, more idiomatic, and more generic version, which doesn't crash on incorrectly-formatted keys.

Of course you just want to read a Vec<String> and not a HashMap<String, HashMap<String, String>>, but I think the basic structure can be adopted to fit your use-case.

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Edit: I started building a rudimentary example for your case: playground.