It comes down to time left on the contract and can that time cover the time it takes you to comment every line of code?

Depending on the vagueness of the contract, yours' sounds pretty vague based on the revision history, you are a hired hand that is to do whatever they ask no matter how absurd you might think it is.

Bottom line is they paid (are paying) for a product that they can use in the future with no loyality to the original developer.

The business side of programming is so ugly.

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