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	This adds caching of the most recent read/program blocks, allowing support of devices that don't have byte-level read+writes, along with reduced device access on devices that do support byte-level read+writes. Note: The current implementation is a bit eager to drop caches where it simplifies the cache layer. This layer is already complex enough. Note: It may be worthwhile to add a compile switch for caching to reduce code size, note sure. Note: This does add a dependency on malloc, which could have a porting layer, but I'm just using the functions from stdlib for now. These can be overwritten with noops if the user controls the system, and keeps things simple for now.