Ash.Filter.Predicate.simplify

You're seeing just the callback simplify, go back to Ash.Filter.Predicate module for more information.
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simplify(predicate)

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Specs

simplify(predicate()) :: term()

Simplify to a more primitive statement.

For example, x in [1, 2] simplifies to x == 1 or x == 2. Simplifying to filter expressions that already have comparisons lets you avoid writing that logic for a given predicate.