I think a fair amount of leniency with input is a good thing. The problem starts when you start to increase your leniency in response to someone else's out-of-s

I think a fair amount of leniency with input is a good thing. The problem starts when you start to increase your leniency in response to someone else's out-of-spec output. A nice thing of open source projects is that they are freeer to call out other software that produces out-of-spec output, and I would encourage them to do so... liberally.