!!internal/typemap: fix Hash assert on windows

Author: bazaah

src/internal/typemap.rs

@@ -408,14 +408,23 @@ impl From<TypeId> for TypeMapKey {
     }
 }
 
-#[derive(Debug, Clone, Hash, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq)]
 enum TypeKey {
     /// A normal [`TypeId`]
     Id(TypeId),
     /// A value that has already been hashed, externally
     ExtHash(u64),
 }
 
+impl std::hash::Hash for TypeKey {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        match self {
+            TypeKey::Id(id) => id.hash(state),
+            TypeKey::ExtHash(pre) => pre.hash(state),
+        }
+    }
+}
+
 /// A hasher designed to eke a little more speed out, given
 /// `TypeId`’s known characteristics.
 ///