Preparer

Preparer is a way to build up an Aggregator through composition using a more natural API. It allows you to start with the input type and describe a series of transformations and aggregations from there, rather than starting from the aggregation and composing “outwards” in both directions.

Uses of Preparer will always start with a call to Preparer[A], and end with a call to monoidAggregate or a related method, to produce an Aggregator instance.

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