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Cleanup: make slave_exec_mode of its enum type and pack Log_event better
Pack these fields together: event_owns_temp_buf cache_type slave_exec_mode checksum_alg Make them bitfields to fit a single 2-byte hole. This saves 24 bytes per event. SLAVE_EXEC_MODE_LAST_BIT is rewritten as > SLAVE_EXEC_MODE_LAST= SLAVE_EXEC_MODE_IDEMPOTENT to avoid a false-positive -Wbitfield-enum-conversion warning: Bit-field 'slave_exec_mode' is not wide enough to store all enumerators of 'enum_slave_exec_mode'.
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