Can you use opaque types to make “value-like” matrix/vector types like vec3, vec4, mat4, etc.? This was the biggest reason I eliminated the Java platform as an

Can you use opaque types to make “value-like” matrix/vector types like vec3, vec4, mat4, etc.? This was the biggest reason I eliminated the Java platform as an option for using it in gamedev. The alternative for Project Valhalla is to either live with the GC costs or use a hack from LWJGL (MemoryStack) which is very unergonomic to use.