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Contracts for free!

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Contracts for free!
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542
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CC Attribution 2.0 Belgium:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
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Nix lacks of a static type system could be really annoying when we want to debug our expression, and understand what's part of code or data is wrong. Dynamic types libraries[1][2] comes to the rescue, giving a simple API to assert that data is valid.