As far as I know and there has never been a change in BTC digit numbers, except when there was Liza, Lizun, Limbo, Lizambo on yobit they do denom the coin and this was also done with consensus of developer. We know that bitcoin is software built on an open protocol and through mutual agreement, any developer (or group of developers) can propose changes and improvements to Bitcoin technology through proposals and these proposals must be agreed by consensus.
For now, the only consensus I have experienced is forks, which are about increasing the network transaction processing limit on bitcoin technical work, namely increasing the block size limit so the network can process more transactions at once.