In Minecraft 1.11.2 and prior versions you were able to hide individual body parts of armour stands by giving body parts infinite rotations.
In the most recent update, you've added code to your Vector3f (client side) that defaults the floats to 0, rather than not rendering the body part.
By being able to hide these body parts, I was able to create very cool armour stand contraptions.
I've included a screenshot taken in 1.11.2 and in 1.12 Pre-Release 7.
I strongly hope you will enable me to hide body parts again by giving them infinite rotations.

Steps to reproduce:

• Spawn an armour stand
• Edit a body part's rotation to have an infinite rotation (Infinityf)
• The body part is invisible in 1.11.2 and below, but visible and rotated to be 0 in 1.12 Pre-Releases.