Distance from the start of the current step (synched children take their frame from it)
ReadonlydefReadonlyscopeReadonlyselfReadonlytargetWhat the tween writes to: a display object or a filter (through their
accessors), or the plain object published code tweens state arrays on
AbstractTween._runActions for this tween's actions
Tween._runActionsRange: runs the actions in the range, stopping when one moves the tween
Tween.setPosition as a timeline drives it (actions are run separately by the timeline). Nothing happens when the raw position does not change.
The playback state of one tween of an instance. The values come from the shared definition; only the positions are per instance.