Now try the trap. Remove builtins.deepSeq result.state from the key line, use s.key + 1 directly, and run it again. genericClosure will churn through all 100,000 steps without complaint. Then Nix tries to evaluate .total, forces a chain 100,000 thunks deep, and dies. The error appears to come from the field access, not the computation. That misdirection is exactly why sternenseemann shelved the whole approach.
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Actuator 2 has a motor 1/2 the diameter and the same length as the motor in actuator 1. At the same power dissipation, the motor produces $\frac{1}{2\sqrt{2}}$ times the torque, so it needs a gear ratio of $2\sqrt{2}$ to produce the same torque at the output of the actuator. The rotor inertia is 1/8th that of the motor in actuator 1, since $j\propto r^{3}$. The reflected inertia after the gearing is $g^{2}j = \frac{(2\sqrt{2})^{2}}{8}= 1$.
Perhaps the most notable feature here, however, is the battery life. Nothing says these headphones will last over five days on a single charge. That's not five days of regular use, working out to several hours each day or whatever. It claims 135 hours of life per charge. As a comparison, Sony's WH-CH520 headphones, which are praised for great battery life, last around 50 hours.