On the documentation front, I just deployed the first set of documentation about request handlers.

It's a generic overview of the feature, what it can do, and how, and list of core functionality each engine provides. There's nothing language-specific there, and no code examples (it's a language-agnostic overview, afterall), but I think it turned out fine nevertheless.

I will likely end up tweaking it further, but this is a good first approximation of what I had in mind. Language-specific reference guides to follow soon.

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