This resolves the following Pyright error message in the numpy._function_base_impl stubs for median and percentile.

Type variable "_ArrayType" may go unsolved if caller supplies no argument for parameter "out"
  Provide an overload that specifies the return type when the argument is not supplied

And even though I doubt that this is likely to cause problems in practice, it's better to solve error messages like these, than to e.g. suppress or ignore them.