Remove Validated.filter#605
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I think this was leftover from copy/paste from `Xor`. It mentions that it's useful when using `Validated` in for-comprehensions, but you can't actually use `Validated` in for-comprehensions since it doesn't have a `flatMap` method :). Also, `Xor` no longer has a `filter` method. It was removed in typelevel#276 since using the monoid zero when the predicate doesn't match is rather arbitrary and can lead to surprises. I think we should follow that precedent for `Validated`.
Current coverage is
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I think this was leftover from copy/paste from
Xor. It mentions thatit's useful when using
Validatedin for-comprehensions, but you can'tactually use
Validatedin for-comprehensions since it doesn't have aflatMapmethod :).Also,
Xorno longer has afiltermethod. It was removed in #276since using the monoid zero when the predicate doesn't match is rather
arbitrary and can lead to surprises. I think we should follow that
precedent for
Validated.