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Simple Flash Key Value store

Tries to keep flash wear low 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.

TODO

read_int()
write_str()
automatic value coercion
support for floats

Ideas

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