[Rails] how to simulate typecasting of ActiveRecord in non-AR classes?

Hi,

I have non-ActiveRecord Ruby classes that I use for numerical (and
other) processing as part of an API service.

I seem to recall that AR will cast attributes, say, from a params hash,
into the data type expected for the attribute. That is useful, and I'm
missing that feature in my non-AR classes. Has anyone considered this
challenge in their own work, and, if so, what mechanism (existing
modules or code snippets) would they propose as a way to introduce
casting?

Thanks,

Grar

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