Cancel this animation. Idempotent — no-op once already finished/canceled.
True iff this handle is currently paused.
Freeze this animation's virtual clock. Idempotent.
Resume this animation's virtual clock. Idempotent.
Retarget mid-flight. null ⇒ switch to decay-mode (no spring force).
Multiply this animation's virtual-clock rate by scale. 1 = normal.
Monotonic id assigned by the animator.