`Path<T>` with numbered object keys

[acurrieclark]

It seems that Path doesn't pick out object keys which are numbers, rather than strings. For example:

const obj = {
  days: {
    1: true,
    "2": false,
    3: true
  }
}

type PathObj = Path<typeof obj>;
//    ^? type PathObj = 'days' | 'days.2'

Example playground for reference