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"Data.Diverse.Many" is an extensible record for any size encoded efficiently as (Int, Map Int Any).

"Data.Diverse.Which" polymorphic variant of possibilities encoded as (Int, Any).

Provides getters, setters, projection, injection, fold, and catamorphisms;
accessed by type or index.

Refer to [ManySpec.hs](https://github.com/louispan/data-diverse/blob/master/test/Data/Diverse/ManySpec.hs) and [WhichSpec.hs](https://github.com/louispan/data-diverse/blob/master/test/Data/Diverse/WhichSpec.hs) for example usages.