Dynamically update Spring Length

I have dynamically changing connectionStrength (as per customLinkLength demo), and need to propagate the change to the physics engine. Spring Transform seems to only set the length initially.

Is there a preferred way to update the spring lengths dynamically?

Start with the customLinkLength demo and the Spring Transform behavior mentioned in the issue. Trace how connectionStrength is passed to the physics engine and determine the preferred update entry point. Done means dynamic strength changes update spring lengths without reinitializing them, with the usage documented or demonstrated.

Written by the indexing model from the issue text.