Upload of content using github.Repository.update_file produces garbled content

Problem Introduction

When trying to upload a json stringified dict to a repository resulting content in the repository is garbled.

Example calling code with explanation

As per Repository.py inputs can either be bytes or a string that is ready to be encoded and therefore transmitted to a repository.

        content_to_transmit = json.dumps(obj)
        try:
            repo = self.github_instance.get_repo(f"{self.org_name}/{self.repo_name}")
            file_path = f"{container_name}/{self.object_files[container_name]}"
            # file_contents = repo.get_contents(file_path, ref=ref, sha=sha)
            write_response = repo.update_file(
                file_path, 
                f"Update object [{self.object_files[container_name]}]", 
                content=content_to_transmit,
                sha=sha, 
                branch=ref
            )
            return [
                True, 
                {
                    "status_msg": f"wrote object [{self.object_files[container_name]}] to container [{container_name}]",
                    "status_code": 200 
                },
                write_response
            ]
        except Exception as e:
            print(e)
            return [
                False, 
                {
                    "status_code":f"unable to write object [{self.object_files[container_name]}] to container [{container_name}] due to [{str(e)}]",
                    "status_msg": 503
                }, 
                str(e)
            ]

When this is called with just the string this error is returned 'bytes' object has no attribute 'encode' which caused me to explore github.Repository.update_file.

Problem resolution

As I inspected the file I found that the if block on line 2495 was improperly indented.

Version in main branch

if not isinstance(content, bytes):
            content = content.encode("utf-8")
content = b64encode(content).decode("utf-8")

As I looked at the code I realized that even if bytes or string was supplied the output would not be correct; therefore, I indented the if block and tried the call again.

Verified fixed version

if not isinstance(content, bytes):
           content = content.encode("utf-8")
           content = b64encode(content).decode("utf-8")

With that changed I tried the call again and was able to find the content in the repository to be correctly received, stored as json, and viewable in the repository. I've provided the original file, the fixed file and a patch file for review.

PyGithub.zip

Start in Repository.py around line 2495 and reproduce Repository.update_file with both string and bytes content. Verify that uploaded JSON is stored and displayed correctly in the repository, using the supplied patch and fixed example as references.