Check it

Author: chrisrink10

src/basilisp/core.lpy

@@ -6959,7 +6959,8 @@
 (def ^:private excluded-proxy-methods
   #{"__getattribute__"
     "__init__"
-    "__new__"})
+    "__new__"
+    "__subclasshook__"})
 
 (def ^:private proxy-cache (atom {}))
 

src/basilisp/lang/interfaces.py

@@ -385,16 +385,17 @@ class IProxy(ABC):
 
     __slots__ = ()
 
-    _proxy_mappings: "IPersistentMap[str, Callable]"
-
+    @abstractmethod
     def _get_proxy_mappings(self) -> "IPersistentMap[str, Callable]":
         raise NotImplementedError()
 
+    @abstractmethod
     def _set_proxy_mappings(
         self, proxy_mappings: "IPersistentMap[str, Callable]"
     ) -> None:
         raise NotImplementedError()
 
+    @abstractmethod
     def _update_proxy_mappings(
         self, proxy_mappings: "IPersistentMap[str, Callable]"
     ) -> None: