make 'crossany' more useful

[aEgoist]

crossany returns 1 both crossover and crossunder situations
why not return 1 for crossover and -1 for crossunder? then use abs(crossany(..)) to get the original returns if needed.
thus we can get crossover and crossunder in a single calculation, otherwise we'd have to call crossover(a,b) and crossover(b,a) to do so.

[codeplea]

I wouldn't want to change the existing cossany() or crossover() functions. They are very useful signals for vectorized algorithms.

It might make sense to create a new function, call it crossdir(), that indicates direction by returning a -1 or 1, as you describe.