Should forces be mutable?

[mbostock]

I’ve modeled forces after curves, easing functions and interpolators, but is it weird that forceLink.strength doesn’t modify the force’s strength, instead returning a new force with the specified strength? So, if you want to change the strength, you need to do something like this:

simulation.on("beforetick.link", simulation.on("beforetick.link").strength(0.2));

That’s… awkward.