disallow assign of fixedbytes of size X to bytes of size Y when X != Y

Author: winsvega

src/ethereum_test_base_types/conversions.py

@@ -1,6 +1,7 @@
 """
 Common conversion methods.
 """
+
 from re import sub
 from typing import Any, List, Optional, SupportsBytes, TypeAlias
 
@@ -63,6 +64,8 @@ def to_fixed_size_bytes(input: FixedSizeBytesConvertible, size: int) -> bytes:
     input = to_bytes(input)
     if len(input) > size:
         raise Exception(f"input is too large for fixed size bytes: {len(input)} > {size}")
+    if len(input) < size:
+        raise Exception(f"input is too small for fixed size bytes: {len(input)} < {size}")
     return bytes(input).rjust(size, b"\x00")
 
 

src/ethereum_test_types/types.py

@@ -672,7 +672,12 @@ def validate_to_as_empty_string(cls, data: Any) -> Any:
         """
         If the `to` field is an empty string, set the model value to None.
         """
-        if isinstance(data, dict) and "to" in data and data["to"] == "":
+        if (
+            isinstance(data, dict)
+            and "to" in data
+            and isinstance(data["to"], str)
+            and data["to"] == ""
+        ):
             data["to"] = None
         return data