Performance improvements, better readme and complete python bindings

include/kpn/fanout.hpp

@@ -1,7 +1,7 @@
 #pragma once
 #include "channel.hpp"
 #include "diagnostics.hpp"
-#include "node.hpp"
+#include "inode.hpp"
 #include "port.hpp"
 #include "traits.hpp"
 
@@ -15,24 +15,6 @@
 
 namespace kpn {
 
-namespace detail {
-
-// Produces std::tuple<T, T, ..., T> with N repetitions — used so that
-// Network::connect can do its normal return_tuple type-check against FanoutNode.
-template<typename T, std::size_t N, typename Seq = std::make_index_sequence<N>>
-struct repeat_tuple;
-
-template<typename T, std::size_t N, std::size_t... Is>
-struct repeat_tuple<T, N, std::index_sequence<Is...>> {
-    template<std::size_t> using always_T = T;
-    using type = std::tuple<always_T<Is>...>;
-};
-
-template<typename T, std::size_t N>
-using repeat_tuple_t = typename repeat_tuple<T, N>::type;
-
-} // namespace detail
-
 // ── FanoutNode ────────────────────────────────────────────────────────────────
 //
 // Reads one item from its single input channel and pushes a copy to each of
@@ -48,7 +30,7 @@ template<typename T, std::size_t N, std::size_t Id = 0>
 class FanoutNode : public INode {
 public:
     using args_tuple   = std::tuple<T>;
-    using return_tuple = detail::repeat_tuple_t<T, N>;
+    using return_tuple = repeat_tuple_t<T, N>;
     using return_raw   = return_tuple;
 
     static constexpr std::size_t input_count    = 1;