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Fixes #1
For Eff functions, Unit is the preferred type.

There are examples in the docs that use {} instead of Unit as the return
type for Eff functions, but Unit is the current preferred type. If you
use {}, you may run into errors along the lines of "Cannot unify
Prelude.Unit with {}".
SEE: http://curtis.io/posts/purescript-for-web-development.html