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Konstantin Varlamov authored and GitHub committed 8633f5f6a3c
Make sure every member of `Error` enum has the `kError` prefix (#5546) This is for consistency with other Firebase C++ SDKs (e.g. [RTDB](https://github.com/firebase/firebase-cpp-sdk/blob/d0fc238bb866c92ed4241b55ddd82c8cf87867cd/database/src/include/firebase/database/common.h#L24-L60)).