Logical task combinators

When I had to use Erlang for the very first time it was a brand new language and I was in collage. Back then Erlang did not have a logical not function so we had to define our own in order to make our code readable. At least given the knowledge me and my lab partner had at the time. So the other week I had a deja vu moment since I had a Task<bool> that I wanted to negate. At first it felt real weird and I ended up solving my problem in a different way. But then I started to think.

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