Add separation comments

src/utils/PugsTraits.hpp

@@ -8,6 +8,8 @@ class TinyVector;
 template <size_t N, typename T>
 class TinyMatrix;
 
+// Traits is_trivially_castable
+
 template <typename T>
 inline constexpr bool is_trivially_castable = std::is_trivial_v<T>;
 
@@ -21,6 +23,8 @@ inline constexpr bool is_trivially_castable<TinyMatrix<N, T>> = is_trivially_cas
 template <size_t N, typename T>
 inline constexpr bool is_trivially_castable<const TinyMatrix<N, T>> = is_trivially_castable<T>;
 
+// Traits is_false
+
 template <typename T>
 inline constexpr bool is_false_v = false;