diff -r f7b87d84864d -r 4f6ca107ccb1 src/euclidean.rs
--- a/src/euclidean.rs	Sun Dec 22 14:54:46 2024 -0500
+++ b/src/euclidean.rs	Sun Dec 22 15:30:34 2024 -0500
@@ -48,11 +48,11 @@
     }
 
     /// Calculate the 2-distance squared $\\|x-y\\|_2^2$, where `self` is $x$.
-    fn dist2_squared(&self, y : &Self) -> F;
+    fn dist2_squared<I : Instance<Self>>(&self, y : I) -> F;
 
     /// Calculate the 2-distance $\\|x-y\\|_2$, where `self` is $x$.
     #[inline]
-    fn dist2(&self, y : &Self) -> F {
+    fn dist2<I : Instance<Self>>(&self, y : I) -> F {
         self.dist2_squared(y).sqrt()
     }