I don't understand what is "one bit larger than the given key". Isn't it 

"/Some/Arbitrarily/long/string"    # the key
"0Some/Arbitrarily/long/string"    # incremented

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? i.e. next ASCII character, unless for "\xff", then put "\0" and carry over?

In reply to Re^3: Add 1 to an arbitrary-length binary string by Anonymous Monk
in thread Add 1 to an arbitrary-length binary string by einhverfr

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