Add pybind11 caster for Task<T>

typon/include/python/builtins.hpp

@@ -378,4 +378,20 @@ auto mapFilter(Map map, Seq seq, Filt filt = Filt()) {
   return typon::PyList(std::move(result));
 }
 
+namespace PYBIND11_NAMESPACE {
+namespace detail {
+    template <typename T> struct type_caster<typon::Task<T>> {
+        using type = typon::Task<T>;
+        using res_conv = make_caster<T>;
+    public:
+        PYBIND11_TYPE_CASTER(type, const_name("Task[") + res_conv::name + const_name("]"));
+
+        template <typename U>
+        static handle cast(U&& src, return_value_policy policy, handle parent) {
+            return res_conv::cast(std::forward<T>(std::move(src).call()), policy, parent);
+        }
+    };
+}
+}
+
 #endif // TYPON_BUILTINS_HPP