Monad operator and visible argument don't get along

[jcheng5]

library(promise)
library(monads)
resolved(cars) %>>% head() %>>% print()

This prints one row instead of 6. I believe this is because then's onFulfilled argument can optionally take a second argument visible, and this is being treated as the second argument to head() (and to print() for that matter). Probably the %>>% interface should only pass along the first argument.

[jcheng5]

Long since fixed