How to get a DampedSpringJoint2D's current length?

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:bust_in_silhouette: Asked By wwoods
:warning: Old Version Published before Godot 3 was released.

I’m trying to set up a damped spring joint that, when stretched to its max length, will break. Does anyone know how to measure the current length of a DampedSpringJoint2D? My only idea is to measure the distance between each object and the joint location initially and at each process step, but that seems redundant as surely the physics engine must already be doing that work.

Thanks,
Walt