comp.lang.perl.announce prerequisites
  finish -priority => -nice migration (in a few weeks)
  finish leading dashes phase-out
  io_STORE - switch over to standard events_mask typemap
  portability?

Some way to assert that a watcher is deleted?  Why still seeing lots
of zombies?

croak should route through Carp!

documentation
  how to design new event types
  how to use $Event::API

optimization
  update io event-mask without invalidating cache
  use fancy profiler tricks to figure out how to improve performance!

time
  figure out caching policy
  CORE::time?
  alternate time encodings
    make relative to $^T
  change speed of time for regression testing

loop
  StarvePrio?

make subclassing work as well as possible

export_fail hook to autoload

accept "%f minutes" & "%f hours" for all time specifications?
