27. implement Flat<T>
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-通过 / -执行
Implement Flat<T> to flatten a tuple type.
type A = Flat<[1,2,3]> // [1,2,3]
type B = Flat<[1,[2,3], [4,[5,[6]]]]> // [1,2,3,4,5,6]
type C = Flat<[]> // []-通过 / -执行
Implement Flat<T> to flatten a tuple type.
type A = Flat<[1,2,3]> // [1,2,3]
type B = Flat<[1,[2,3], [4,[5,[6]]]]> // [1,2,3,4,5,6]
type C = Flat<[]> // []