Applies type hint to to process_nested

bittensor_cli/src/bittensor/chain_data.py

@@ -1,7 +1,8 @@
 from abc import abstractmethod
 from dataclasses import dataclass
+from collections.abc import Sequence
 from enum import Enum
-from typing import Optional, Any, Union
+from typing import Optional, Any, Union, Callable, Hashable
 
 import netaddr
 from scalecodec.utils.ss58 import ss58_encode
@@ -69,19 +70,25 @@ def _chr_str(codes: tuple[int]) -> str:
     return "".join(map(chr, codes))
 
 
-def process_nested(data: Union[tuple, dict], chr_transform):
+def process_nested(
+    data: Sequence[dict[Hashable, tuple[int]]] | dict,
+    chr_transform: Callable[[tuple[int]], str],
+) -> list[dict[Hashable, str]] | dict[Hashable, str]:
     """Processes nested data structures by applying a transformation function to their elements."""
-    if isinstance(data, (list, tuple)):
+    if isinstance(data, Sequence):
         if len(data) > 0 and isinstance(data[0], dict):
             return [
                 {k: chr_transform(v) for k, v in item.items()}
                 if item is not None
                 else None
                 for item in data
             ]
+        # TODO @abe why do we kind of silently fail here?
         return {}
     elif isinstance(data, dict):
         return {k: chr_transform(v) for k, v in data.items()}
+    else:
+        raise TypeError(f"Unsupported data type {type(data)}")
 
 
 @dataclass