I should have just compressed it first, however, our experience has been that code that passes JSLint always works when minified and code that doesn't regularly - though not always - has issues that are not always obvious.
Our standard has been to JSLint all code to increase our odds that all code paths are Ok, not just the ones we've managed to test (min'd vs orig).
I'd still encourage you to JSLint the source as it will minimize the chances there is code that will not minify gracefully.
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