proof: fix panic for keys with all 0xff bytes #288
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Fixes #286. The `cpIncr()` function incorrectly incremented all bytes for values that are all `0xff` before appending `0x00`. In these cases it should keep the original value and append `0x00`.
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Fixes #286. The
cpIncr()function incorrectly incremented all bytes for values that are all0xffbefore appending0x00. In these cases it should keep the original value and append0x00.