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Haskell's default laziness stores data fields as thunks. Making data types strict by default with StrictData prevents space leaks from thunk buildup, while selective laziness preserves composability where it matters.
Long-running Haskell services often leak memory through thunk accumulation, not retained data. GHC's StrictData pragma flips record fields to strict-by-default—here's how to apply it safely and verify it with heap profiles.
haskell