Within LTS Haskell 8.20 (ghc-8.0.2)
Write in the reference a value The new key must be the same than the old key of the previous object stored otherwise, an error "law of key conservation broken" will be raised WARNING: the value to be written in the DBRef must be fully evaluated. Delayed evaluations at serialization time can cause inconsistencies in the database. In future releases this will be enforced.
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