diff --git a/src/prerelease.rs b/src/prerelease.rs
index 9848b1b..39687ff 100644
--- a/src/prerelease.rs
+++ b/src/prerelease.rs
@@ -95,17 +95,17 @@ impl From<PreRelease> for u16 {
         match value {
             PreRelease::Alpha(Some(v)) => {
                 let v = u16::from(v) & mask;
-                v & 0o2_000
+                v | 0o2_000
             }
             PreRelease::Alpha(None) => 0o2_000,
             PreRelease::Beta(Some(v)) => {
                 let v = u16::from(v) & mask;
-                v & 0o4_000
+                v | 0o4_000
             }
             PreRelease::Beta(None) => 0o4_000,
             PreRelease::RC(Some(v)) => {
                 let v = u16::from(v) & mask;
-                v & 0o10_000
+                v | 0o10_000
             }
             PreRelease::RC(None) => 0o10_000,
             PreRelease::None => 0o20_000,
@@ -141,9 +141,20 @@ impl TryFrom<u16> for PreRelease {
 
 impl PartialEq for PreRelease {
     fn eq(&self, other: &Self) -> bool {
-        let a: u16 = (*self).into();
-        let b: u16 = (*other).into();
-        a == b
+        let _one = NonZeroU16::new(1).unwrap();
+        match (self, other) {
+            (PreRelease::Alpha(Some(_one)), PreRelease::Alpha(None))
+            | (PreRelease::Alpha(None), PreRelease::Alpha(Some(_one)))
+            | (PreRelease::Beta(Some(_one)), PreRelease::Beta(None))
+            | (PreRelease::Beta(None), PreRelease::Beta(Some(_one)))
+            | (PreRelease::RC(Some(_one)), PreRelease::RC(None))
+            | (PreRelease::RC(None), PreRelease::RC(Some(_one))) => true,
+            _ => {
+                let a: u16 = (*self).into();
+                let b: u16 = (*other).into();
+                a == b
+            }
+        }
     }
 }
 
@@ -159,9 +170,7 @@ impl cmp::Ord for PreRelease {
 
 impl PartialOrd for PreRelease {
     fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {
-        let a: u16 = (*self).into();
-        let b: u16 = (*other).into();
-        Some(a.cmp(&b))
+        Some(self.cmp(other))
     }
 }
 
@@ -210,12 +219,42 @@ mod tests {
 
     #[test]
     fn equality() {
-        let a: u16 = PreRelease::Alpha(None).into();
-        let b: u16 = PreRelease::Alpha(Some(NonZeroU16::new(1).unwrap())).into();
-        assert_eq!(a, b);
         assert_eq!(
             PreRelease::Alpha(None),
             PreRelease::Alpha(Some(NonZeroU16::new(1).unwrap())),
         );
+        assert_eq!(
+            PreRelease::Beta(None),
+            PreRelease::Beta(Some(NonZeroU16::new(1).unwrap()))
+        );
+        assert_eq!(
+            PreRelease::RC(None),
+            PreRelease::RC(Some(NonZeroU16::new(1).unwrap()))
+        );
+    }
+
+    #[test]
+    fn ordering() {
+        assert!(
+            PreRelease::Alpha(Some(NonZeroU16::new(2).unwrap()))
+                > PreRelease::Alpha(Some(NonZeroU16::new(1).unwrap()))
+        );
+        assert!(PreRelease::Alpha(Some(NonZeroU16::new(2).unwrap())) > PreRelease::Alpha(None));
+        assert!(
+            PreRelease::Beta(Some(NonZeroU16::new(2).unwrap()))
+                > PreRelease::Beta(Some(NonZeroU16::new(1).unwrap()))
+        );
+        assert!(PreRelease::RC(Some(NonZeroU16::new(2).unwrap())) > PreRelease::RC(None));
+        assert!(
+            PreRelease::RC(Some(NonZeroU16::new(2).unwrap()))
+                > PreRelease::RC(Some(NonZeroU16::new(1).unwrap()))
+        );
+        assert!(PreRelease::RC(Some(NonZeroU16::new(2).unwrap())) > PreRelease::RC(None));
+        assert!(PreRelease::None > PreRelease::RC(None));
+        assert!(PreRelease::None > PreRelease::Beta(None));
+        assert!(PreRelease::None > PreRelease::Alpha(None));
+        assert!(PreRelease::RC(None) > PreRelease::Beta(None));
+        assert!(PreRelease::RC(None) > PreRelease::Alpha(None));
+        assert!(PreRelease::Beta(None) > PreRelease::Alpha(None));
     }
 }