Implement toList directly in the Foldable instance#36
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Currently, the `Foldable DList` instance relies on the default implementation of `toList`. However, this default implementation is somewhat indirect since it uses `foldr`. `toList` can be more directly implemented as `toList = Data.DList.toList`, which avoids the need for `foldr` entirely.
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Currently, the
Foldable DListinstance relies on the default implementation oftoList. However, this default implementation is somewhat indirect since it usesfoldr.toListcan be more directly implemented astoList = Data.DList.toList, which avoids the need forfoldrentirely.