:art: Reflection cast: use isa over base_type

diff --git a/plug b/plug
index 90eb5fbce4232acc65ef205e662934c249b5c6a9..59d632b3d8adb06134559385d8af610ff7df6a4c 160000 (submodule)
--- a/plug
+++ b/plug
@@ -1 +1 @@
-Subproject commit 90eb5fbce4232acc65ef205e662934c249b5c6a9
+Subproject commit 59d632b3d8adb06134559385d8af610ff7df6a4c