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This package provides a FIFO channel for STM supporting a size limit. When
this limit is reached, older entries are discarded to make way for newer
entries.
The motivation for this is logging. If log entries are written to a plain
TChan, the program will use a lot of memory if it produces log entries
faster than they can be processed. If log entries are written to a bounded
channel where writes block (e.g. the stm-chans package), the program may
deadlock if the log channel fills up. With Data.STM.RollingQueue, old
entries will be discarded instead.
Possible improvements (not available in Data.STM.RollingQueue) include:
Discard lower-priority entries first.
Discard every other entry, so some of the older entries will still be
available.
