diff --git a/src/length.rs b/src/length.rs
index d92997d..1c9add0 100644
--- a/src/length.rs
+++ b/src/length.rs
@@ -282,26 +282,6 @@ mod tests {
         assert_eq!(length.get(), vec![1, 2, 3, 4]);
     }
 
-    #[test]
-    fn test_fmt_debug() {
-        // Debug and display format the value only.
-        let one_cm: Length<f32, Mm> = Length::new(10.0);
-
-        let result = format!("{:?}", one_cm);
-
-        assert_eq!(result, "10");
-    }
-
-    #[test]
-    fn test_fmt_display() {
-        // Debug and display format the value only.
-        let one_cm: Length<f32, Mm> = Length::new(10.0);
-
-        let result = format!("{}", one_cm);
-
-        assert_eq!(result, "10");
-    }
-
     #[test]
     fn test_add() {
         let length1: Length<u8, Mm> = Length::new(250);
diff --git a/src/transform2d.rs b/src/transform2d.rs
index 7ba417c..d782a2f 100644
--- a/src/transform2d.rs
+++ b/src/transform2d.rs
@@ -357,7 +357,6 @@ where T: Copy + Clone +
          Mul<T, Output=T> +
          Div<T, Output=T> +
          Neg<Output=T> +
-         ApproxEq<T> +
          PartialOrd +
          Trig +
          One + Zero {
diff --git a/src/transform3d.rs b/src/transform3d.rs
index c979164..7993ae7 100644
--- a/src/transform3d.rs
+++ b/src/transform3d.rs
@@ -117,7 +117,6 @@ where T: Copy + Clone +
          Mul<T, Output=T> +
          Div<T, Output=T> +
          Neg<Output=T> +
-         ApproxEq<T> +
          PartialOrd +
          Trig +
          One + Zero {
@@ -190,7 +189,8 @@ where T: Copy + Clone +
         (m33 * det) < _0
     }
 
-    pub fn approx_eq(&self, other: &Self) -> bool {
+    pub fn approx_eq(&self, other: &Self) -> bool
+    where T : ApproxEq<T> {
         self.m11.approx_eq(&other.m11) && self.m12.approx_eq(&other.m12) &&
         self.m13.approx_eq(&other.m13) && self.m14.approx_eq(&other.m14) &&
         self.m21.approx_eq(&other.m21) && self.m22.approx_eq(&other.m22) &&
diff --git a/src/vector.rs b/src/vector.rs
index 456e1a6..6bdef1a 100644
--- a/src/vector.rs
+++ b/src/vector.rs
@@ -166,7 +166,7 @@ where T: Copy + Mul<T, Output=T> + Add<T, Output=T> + Sub<T, Output=T> {
     }
 
     #[inline]
-    pub fn length(&self) -> T where T: Float + ApproxEq<T> {
+    pub fn length(&self) -> T where T: Float {
         self.square_length().sqrt()
     }
 }