Function memo

Example

// tree is 1 / 3 of node, 2 / 3 of leaf
const tree: fc.Memo<Tree> = fc.memo(n => fc.oneof(node(n), leaf(), leaf()));
const node: fc.Memo<Tree> = fc.memo(n => {
  if (n <= 1) return fc.record({ left: leaf(), right: leaf() });
  return fc.record({ left: tree(), right: tree() }); // tree() is equivalent to tree(n-1)
});
const leaf = fc.nat;
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