message: code review: using std::isnan required also in propagate_alpha_filtration
diff: @@ -485,6 +485,8 @@ class Alpha_complex {
  void propagate_alpha_filtration(SimplicialComplexForAlpha& complex, Simplex_handle f_simplex) {
  // From SimplicialComplexForAlpha type required to assign filtration values.
  using Filtration_value = typename SimplicialComplexForAlpha::Filtration_value;
  + // To support more general types for Filtration_value
  + using std::isnan;
  // ### Foreach Tau face of Sigma
  for (auto face_opposite_vertex : complex.boundary_opposite_vertex_simplex_range(f_simplex)) {
  