For practical applications this mutually recursive tree/forest pair seems like a strictly worse version of a rose tree, which can be defined as type RoseTree = { value: A, children: Array}. Rose trees are my favorite data structure. In some cases children could be better served by a linked list rather than an array, which brings these two structures closer to one another, but the fact that a rose tree cannot contain gaps and that its definition is not mutually recursive are points in its favor. ↩
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not just subject to the randomness of whether another module happens to，详情可参考谷歌
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