abs-lang / abs / 630

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master: 76%

Pull #240

travis-ci-com

Allow negative in expressions, closes #239

In expressions used to return their own object.Boolean.
When we use the bang operator against them we check if
result = object.TRUE or object.FALSE. Since they returned
their own object.Boolean, which is not equal to object.TRUE|FALSE,
negation would fail (always returning false).

With this change I actually got rid of all the checks we do
when evaluating a bang expression and simply rely on the logic
behind `isTruthy`, which will avoid duplication and incoherence
in the future.

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