Bullet Physics version on Cocos 3.15.1?

Bullet Physics version on Cocos 3.15.1?
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Hi!
This is my first question ever here. Glad to join this awesome community.

I’m trying to find out what’s the Bullet Physics version integrated in Cocos 2D-X 3.15.1. I know that the latest version of Bullets is 2.86 but, I’ve been looking in the changelog, and I can’t find a single reference to Bullet.
I need to know this int order to look for the right documentation.
Does anyone knows?
Thanks!

I need to know,too.