switch loader to chaining pattern

[ScottSuarez]

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[ScottSuarez]

@modular-magician assign-reviewer @melinath

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[modular-magician]

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[melinath]

I'm not currently convinced this is significantly more ergonomic, but I don't think it's worse either.

The one thing is that I suspect we might want to keep Validate as a separate call.

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

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