Avoid the type checker some other way...

Author: Julian

referencing/_core.py

@@ -168,7 +168,7 @@ def pointer(self, pointer: str, resolver: Resolver[D]) -> Resolved[D]:
 
             # FIXME: this is slightly wrong, we need to know that we are
             #        entering a subresource specifically, not just any mapping
-            if not isinstance(contents, Sequence):
+            if isinstance(contents, Mapping):
                 subresource = self._specification.create_resource(contents)  # type: ignore[reportUnknownArgumentType]  # noqa: E501
                 resolver = resolver.in_subresource(subresource)
         return Resolved(contents=contents, resolver=resolver)  # type: ignore[reportUnknownArgumentType]  # noqa: E501