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Check target type, allowed values, missing targets and whether it is known at prediction time. Concepts: Target validation; label definition Project A: credit_risk has exactly 2 values (Good/Bad); target = 1 for Bad so that 'recall' means 'bad applicants caught'. Project B: Load in MW, hourly; no negatives; decide how to handle the few missing target hours (interpolate for EDA, never for evaluation).