57. implement ObjectPaths<O>

- accepted / - tried

Implement ObjectPaths<O> to return all valid paths to properties.

type Obj = {  a: {    b: {      c: 1,      d: 2    },    e: 1  },  f: 3}type A = ObjectPaths<Obj>// 'a.b.c' | 'a.b.d' | 'a.e' | 'f'

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