fix: resolve isinstance union syntax runtime error

Fixed isinstance calls to use tuple syntax (str, bytes) instead of
union syntax (str | bytes) which is not supported at runtime in
Python 3.10. Added UP038 ignore rule to ruff config to prevent
this regression.

Union syntax in isinstance is only for type annotations, not runtime.

Author: jdrhyne

pyproject.toml

@@ -83,6 +83,7 @@ ignore = [
     "D100",  # Missing docstring in public module
     "D104",  # Missing docstring in public package
     "D107",  # Missing docstring in __init__
+    "UP038", # Use `X | Y` in `isinstance` call instead of `(X, Y)` - not supported in Python 3.10 runtime
 ]
 
 [tool.ruff.lint.pydocstyle]

tests/integration/test_direct_api_integration.py

@@ -26,7 +26,7 @@ def assert_is_pdf(file_path_or_bytes: str | bytes) -> None:
     Args:
         file_path_or_bytes: Path to file or bytes content to check.
     """
-    if isinstance(file_path_or_bytes, str | bytes):
+    if isinstance(file_path_or_bytes, (str, bytes)):
         if isinstance(file_path_or_bytes, str):
             with open(file_path_or_bytes, "rb") as f:
                 content = f.read(8)

tests/integration/test_live_api.py

@@ -27,7 +27,7 @@ def assert_is_pdf(file_path_or_bytes: str | bytes) -> None:
     Args:
         file_path_or_bytes: Path to file or bytes content to check.
     """
-    if isinstance(file_path_or_bytes, str | bytes):
+    if isinstance(file_path_or_bytes, (str, bytes)):
         if isinstance(file_path_or_bytes, str):
             with open(file_path_or_bytes, "rb") as f:
                 content = f.read(8)

tests/integration/test_new_tools_integration.py

@@ -28,7 +28,7 @@ def assert_is_pdf(file_path_or_bytes: str | bytes) -> None:
     Args:
         file_path_or_bytes: Path to file or bytes content to check.
     """
-    if isinstance(file_path_or_bytes, str | bytes):
+    if isinstance(file_path_or_bytes, (str, bytes)):
         if isinstance(file_path_or_bytes, str):
             with open(file_path_or_bytes, "rb") as f:
                 content = f.read(8)