How many times this outlet's value has actually changed. Downstream
nodes compare against this to decide whether a dirty mark was a real
change or a false alarm. 0 means nothing has been produced yet.
Evaluates this outlet and returns its value.
Pull-based: the owning node recomputes only if it is dirty and an upstream version actually changed. A clean node returns the cached value without touching the rest of the graph.
Returns the cached value without evaluating anything, or undefined
if this outlet has never produced one. Use it to inspect graph state
(a debug view, a node inspector) without forcing computation.
A node's typed output port.