coremem_types: Conductor: make inner member private

this must mean the type's not being used, as it's now unconstructable.

crates/types/src/mat/conductor.rs

@@ -5,11 +5,10 @@ use crate::vec::Vec3;
 #[cfg(feature = "serde")]
 use serde::{Serialize, Deserialize};
 
-// TODO: Conductor inner member shouldn't be public
 #[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
 #[cfg_attr(feature = "fmt", derive(Debug))]
 #[derive(Copy, Clone, Default, PartialEq)]
-pub struct Conductor<T>(pub T);
+pub struct Conductor<T>(T);
 pub type AnisomorphicConductor<R> = Conductor<Vec3<R>>;
 pub type IsomorphicConductor<R> = Conductor<R>;