b64encode returns a bytes object, meaning that SyncToken.build_sync_token returns something like b'eyrestOfToken'. When we later set it as a header, Flask (or something else internally) calls str on whatever was passed. A str'd bytes object wraps it in quotes in its repr'd form, so we get "b'eyrestOfToken" which is not base64-decodable.
This fixes an issue where sync tokens can never be read and endlessly loop, causing every sync to fail.
b64encodereturns abytesobject, meaning thatSyncToken.build_sync_tokenreturns something likeb'eyrestOfToken'. When we later set it as a header, Flask (or something else internally) callsstron whatever was passed. Astr'dbytesobject wraps it in quotes in its repr'd form, so we get"b'eyrestOfToken"which is not base64-decodable.This fixes an issue where sync tokens can never be read and endlessly loop, causing every sync to fail.