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Lumifer comments on The horrifying importance of domain knowledge - Less Wrong Discussion
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Comments (236)
Which sounds nice right up until a production system shuts itself down gracefully a few hours before a daylights saving time switch purely because of tests which turn out to be more picky than the actual thing they're supposed to be protecting.
Multi-byte characters can do surprising things to scripts designed to truncate logs written by someone who didn't take into account the maximum size of characters and chinese production server names.
A lot of a programmers day can end up being related to fixing bugs due to incorrect assumptions or failing to take edge cases into account and knowing lots of edge cases and handling a reasonable portion of them right away is far better than making the most restrictive possible assumptions off the bat.
You don't want to end up running into the Y2Gay problem: http://qntm.org/gay
Do you know that "the system" can handle that input fine? If you do, why did you sanity check reject it?
Sanity checks are just code -- you certainly can write bad ones. So?
That post argues via mind-numbingly stupid strawmen (or should that be strawschemas?). Yes, you should try to be not stupid, most of the time, to the best of your ability. I agree :-/