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This is something that hopefully helps me solve #22.
Basically it lets the user add a safe guard in case the process that has acquired the lock dies (e.g. due SIGKILL) by being able to renew the lock expiration to a later time. I imagine the usage to be:
let me know if it's something you're interested in, in that case maybe the get+set has to be done in a single redis transaction and I should also add some docs in the readme. Otherwise I'll just keep the fork for our project