Function postOrderValues

Return all tree values in depth-first post-order. Parents appear after their children. For example:

// ┬1
// ├┬2
// │└┬3
// │ └─4
// └─5
const myTree = branch(
  1, [
    branch(2, [
      branch(3, [
        leaf(4),
      ]),
    ]),
    leaf(5),
  ]
)

const myValues = postOrderValues(myTree) // [4, 3, 2, 5, 1]
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