ReadOnly, ReadWrite, and NextTimeStep can be regular singletons by just caching the output of __new__ definition.
Join, RisingEdge, FallingEdge, and ValueChange should all be cached on the objects they take as arguments: in Task.join or handles via methods that will be introduced in #3855.
ReadOnly,ReadWrite, andNextTimeStepcan be regular singletons by just caching the output of__new__definition.Join,RisingEdge,FallingEdge, andValueChangeshould all be cached on the objects they take as arguments: inTask.joinor handles via methods that will be introduced in #3855.