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Fix a confusing heading

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Michael Snoyman 2015-10-20 16:44:55 +00:00
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content/covariance-contravariance.md
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@ -23,7 +23,7 @@ without diving into the category theory behind them too much. For more
information, please see [the Wikipedia page on covariance and
contravariance](https://en.wikipedia.org/wiki/Covariance_and_contravariance_%28computer_science%29).
## Functors are covariant
## The Functor typeclass: covariant functor
Let's consider the following functions (made monomorphic for clarity):