Variable unzipConst

Unzip a tree of [A, B] into a pair of congruent trees of types A and B.

const zippedTree: Tree<[string, number]> = tree(
  ['a', 1],
  [leaf(['b', 2])],
)

const [left, right] = unzip(zippedTree)
//  left = branch('a', [leaf('b')])
// right = branch( 1 , [leaf( 2 )])
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