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4016fc5ad7
Hints for data args don't work. We do all the work, but at the final stage we patch arg in the _old_ program, not in the _new_ one. So programs passed to the callback are all the same and don't contain any mutations. Tests did not catch this because they work right before that point (don't test the actual interface function MutateWithHints). Fix that and add a test that catches this.