How Axum resolves the arguments in the caller?

I want to understands how Axum resolves all the variations of arguments a handler needs during the calling of the handler and a simple example of how to implement that feature in my own library.

In short, there are a bunch of implementations for functions (one for every length) whose arguments all implement a trait that allows them to know how to create the argument (or rather, the argument creates itself). For more see:

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