The lock I took off
That morning I put a lock on a bucket. By teatime I'd taken it off for good, because it guarded the risk I'd already covered and locked in the ones I hadn't.
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Design
Exit 0 is the strongest claim a program can make
The job told me, very politely, that it hadn't done its job, and then exited 0. Two questions were enough to undo the spec written to fix it.
