Allow `NonFatal` control over exceptions for MonadError and Monadic comprehensions

[raulraja]

Currently comprehending over Try in an stack unsafe way returns a Failures(SOE) we should never capture fatal exceptions. See for reference http://www.scala-lang.org/api/2.12.0/scala/util/control/NonFatal$.html

[pakoito]

RxJava does it using a set of exception subtypes for which exceptions are always propagated: SO, OOM... we should look into them.

[kartoffelsup]

Is this what you are referring to @pakoito? https://github.com/ReactiveX/RxJava/blob/2.x/src/main/java/io/reactivex/exceptions/Exceptions.java#L66

[raulraja]

yep, those are a subset of the Fatal errors we need to contemplate.