# Functions
OpenWAL a new write ahead log.
# Variables
ErrCorruptLog is returns when the log is corrupt.
ErrLogClosed is returned when an operation cannot be completed because the log is closed.
ErrLogEntryNotFound is returned when an entry is not found.
ErrLogIndexOutOfOrder is returned from Write() when the index is not equal to LastIndex()+1.
ErrLogIndexOutOfRange is returned from TruncateFront() and TruncateBack() when the index not in the range of the log's first and last index.
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