+1 or -1 for renaming `Either.cond` to `Either.invariant` and making the left side the error one?

# arrow-contributors

[pakoito]

+1 or -1 for renaming Either.cond to Either.invariant and making the left side the error one?

[Hiosdra]

+1 for making left side as error one
But I am curious about if that rename would be good for people entering FP world.
With cond or maybe conditionally , probably every programmer all around the world will know what it means -> there some condition and some reaction to the condition’s result.
With invariant -> I think this is a terminology with overhead and many people must learn by heart to know what it is doing