schedulers:

operator	scheduler	_scheduler	forwarding	composed	depends
amb	-	-	X	-
as_observable	-	-	X	-
average	-	-	X	X
buffer	-	-	X	X	window*, flat_map
buffer_when	-	-	X	X	window*, flat_map,
buffer_toggle	-	-	X	X	window*, flat_map
buffer_with_count	-	-	X	X	window*, flat_map, filter, map, to_terable
buffer_with_time	X	-	X	X	window*, flat_map
buffer_with_time_or_count	X	-	X	X	window*, flat_map
catch::catch_handler	-	-	X	-
catch::rx.catch	-	-	X	X	rx.catch
combine_latest	-	-	X	X	rx.combine_latest
concat	-	-	X	X	rx.concat
contains	-	-	X	X	filter, some
count	-	-	X	X	filter, reduce, count
debounce	X	X	?	?
throttle_with_mapper	-	-	X	-
delay	X	X	?	?
delay_subscription	X	-	X	X	delay_with_mapper, rx.timer, rx.empty
delay_with_mapper	-	?	?	-
dematerialize	-	-	X	-
?	?	?	?	?
?	?	?	?	?
?	?	?	?	?
?	?	?	?	?
?	?	?	?	?