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Implement a Python function called base64 decode that decodes a URL-safe Base64-encoded value.

Implement a Python function called base64 decode that decodes a URL-safe Base64-encoded value.: a task in repo2rlenv-r2e (Harbor dataset). The function signature is: python def base64 decode(string: str bytes) - bytes:

The task

The function signature is: ```python def base64_decode(string: str | bytes) -> bytes: ```

Part of FineEnvs/repo2rlenv-r2e.