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Refactoring difficulties
Most of the local variables were really more properties of the job that were discovered as the flow went along
Was hard to break up into sub-functions because you'd have to pass so many parameters (and return them back)
Could use a hash, but one typo would ruin your day and never be discovered
Even when the bug occured in the field, you got no diagnostics to pinpoint the problem
Assertion points: at some places, a subset of the data *had* to be defined.
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