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Simple Flash Key Value store

Tries to keep flash wear low and speed high by continuously appending data, automatically erasing and rewriting when full.

Store requirements

Reading must be possible by memory-mapping a &[u8] slice
Must support erase() for compaction,
Writing must support program() with an offset and &[u8] payload

For details see trait StoreBackend.

Ideas

iterator (quadratic)
compaction to a second backend instead on stack
StoreBackend-configurable erased data detection