_
check validity of options
extract timer-related specs to specs/timers.spec.js
get rid of single
timer with custom output
timer with custom error
add a TODO item
Flow is now a function
flow.asFunction() can now return flow
inline asFunction()
inline toString()
get rid of asFunction()
get rid of .run()
get rid of deperecated arg
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update TODO list
get rid of unneeded deps
re-enable a test
handling circular output