From 102f96363548adae27c865471c636ca68e9f6314 Mon Sep 17 00:00:00 2001
From: Andy Scott <andy.g.scott@gmail.com>
Date: Sun, 30 Apr 2017 11:31:40 -0700
Subject: [PATCH] Unseal InjectK to allow for extension by other libraries

---
 core/src/main/scala/cats/InjectK.scala | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/core/src/main/scala/cats/InjectK.scala b/core/src/main/scala/cats/InjectK.scala
index b2c76b99058..856dd4082f9 100644
--- a/core/src/main/scala/cats/InjectK.scala
+++ b/core/src/main/scala/cats/InjectK.scala
@@ -9,14 +9,14 @@ import cats.data.EitherK
  *
  * @see [[http://www.staff.science.uu.nl/~swier004/publications/2008-jfp.pdf]]
  */
-sealed abstract class InjectK[F[_], G[_]] {
+trait InjectK[F[_], G[_]] extends Serializable {
   def inj: FunctionK[F, G]
 
   def prj: FunctionK[G, λ[α => Option[F[α]]]]
 
-  def apply[A](fa: F[A]): G[A] = inj(fa)
+  final def apply[A](fa: F[A]): G[A] = inj(fa)
 
-  def unapply[A](ga: G[A]): Option[F[A]] = prj(ga)
+  final def unapply[A](ga: G[A]): Option[F[A]] = prj(ga)
 }
 
 private[cats] sealed abstract class InjectKInstances {