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Withdraw BIP151 #772
The BIP151 proposal does have some practical downsides and thus a new proposal has been made (https://gist.github.com/jonasschnelli/c530ea8421b8d0e80c51486325587c52)
The main reason why this number/proposal should and probably cannot be re-used for a new, heavy incompatible proposal is, that implementations have been made (bcoin, armory). I don't think they are (no longer) in production but still,... the code is available.