Flag collisions was causing some unexpected behavior in some situations.
Removing the source of collisions resolve odd cancelation behavior in
the ev/ module where multiple calls to ev/cancel on the same fiber would
mess with the internal fiber flags and cause bad behavior and the wrong
error message return (but still otherwise behave correctly, so unless
you were parsing the returned error messages, things likely worked).
Also leave comments and test to avoid regressions.
Calvin Rose
5fb06039f3