Simplify metadata typing

twine/commands/check.py

@@ -20,7 +20,6 @@
 from typing import IO
 from typing import List
 from typing import Tuple
-from typing import cast
 
 import readme_renderer.rst
 
@@ -89,7 +88,7 @@ def _check_file(
         )
         description_content_type = "text/x-rst"
 
-    content_type, params = cgi.parse_header(cast(str, description_content_type))
+    content_type, params = cgi.parse_header(description_content_type)
     renderer = _RENDERERS.get(content_type, _RENDERERS[None])
 
     if description in {None, "UNKNOWN\n\n\n"}:

twine/package.py

@@ -16,12 +16,10 @@
 import io
 import os
 import subprocess
-from typing import IO
+from typing import Any
 from typing import Dict
 from typing import Optional
-from typing import Sequence
 from typing import Tuple
-from typing import Union
 
 import pkg_resources
 import pkginfo
@@ -46,8 +44,6 @@
     ".zip": "sdist",
 }
 
-MetadataValue = Union[str, Sequence[str], Tuple[str, IO, str]]
-
 
 class PackageFile:
     def __init__(
@@ -110,7 +106,7 @@ def from_filename(cls, filename: str, comment: Optional[str]) -> "PackageFile":
 
         return cls(filename, comment, meta, py_version, dtype)
 
-    def metadata_dictionary(self) -> Dict[str, MetadataValue]:
+    def metadata_dictionary(self) -> Dict[str, Any]:
         meta = self.metadata
         data = {
             # identify release

twine/repository.py

@@ -103,9 +103,7 @@ def close(self) -> None:
         self.session.close()
 
     @staticmethod
-    def _convert_data_to_list_of_tuples(
-        data: Dict[str, package_file.MetadataValue]
-    ) -> List[Tuple[str, package_file.MetadataValue]]:
+    def _convert_data_to_list_of_tuples(data: Dict[str, Any]) -> List[Tuple[str, Any]]:
         data_to_send = []
         for key, value in data.items():
             if key in KEYWORDS_TO_NOT_FLATTEN or not isinstance(value, (list, tuple)):