René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Metadata type changed from `list` to `tuple` affecting modification via interceptor","articleBody":"The following change https://github.com/googleapis/python-api-core/commit/d96eb5cdd8120bfec97d62b09512c6fecc325be8 introduces a breaking change by changing the type of metadata from a list to a tuple resulting in users to not be able to modify the metadata via an interceptor.\r\n\r\nThe following showcase [tests](https://github.com/googleapis/gapic-generator-python/blob/main/tests/system/test_grpc_interceptor_streams.py) in the generator break, since the interceptor can no longer modify the metadata (or assign it a new value) via this function:\r\n\r\n```python3\r\ndef _add_metadata(self, client_call_details):\r\n        if client_call_details.metadata is not None:\r\n            client_call_details.metadata.append((self._key, self._value))\r\n\r\n``` \r\n","author":{"url":"https://github.com/ohmayr","@type":"Person","name":"ohmayr"},"datePublished":"2024-05-24T18:25:26.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/660/python-api-core/issues/660"}