Fix recursion error in sizesof (#406)

* fix recursion error in sizesof

* format

Author: jfeser

effectful/handlers/jax/_handlers.py

@@ -12,7 +12,8 @@
 
 import tree
 
-from effectful.ops.semantics import apply, evaluate, fvsof, handler, typeof
+from effectful.internals.runtime import interpreter
+from effectful.ops.semantics import apply, evaluate, fvsof, typeof
 from effectful.ops.syntax import (
     Scoped,
     _CustomSingleDispatchCallable,
@@ -74,7 +75,7 @@ def _getitem_sizeof(x: jax.Array, key: tuple[Expr[IndexElement], ...]):
     def _apply(op, *args, **kwargs):
         return defdata(op, *args, **kwargs)
 
-    with handler({jax_getitem: _getitem_sizeof, apply: _apply}):
+    with interpreter({jax_getitem: _getitem_sizeof, apply: _apply}):
         evaluate(value)
 
     return sizes