message: Also provide ssize_t for wasserstein
  I think I'll merge the 2 files later.
diff: * - YYYY/MM Author: Description of the modification
  */
  -#include <hera/wasserstein.h> // Hera
  -
  #include <pybind11_diagram_utils.h>
  +#ifdef _MSC_VER
  +// https://github.com/grey-narn/hera/issues/3
  +// ssize_t is a non-standard type (well, posix)
  +using py::ssize_t;
  +#endif
  +
  +#include <hera/wasserstein.h> // Hera
  +
  double wasserstein_distance(
  Dgm d1, Dgm d2,
  double wasserstein_power, double internal_p,
  