Use index_by and index_with wherever possible
Using `index_by` or `index_with` is more concise than `each_with_object` and more performant than `map { ... }.to_h` or `Hash[map { ... }]`.
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Using `index_by` or `index_with` is more concise than `each_with_object` and more performant than `map { ... }.to_h` or `Hash[map { ... }]`.