[BUGFIX lts] Remove all own listeners

We were previously only removing own listeners if they were functions,
this PR updates us to always remove all of them.

packages/@ember/-internals/meta/lib/meta.ts

@@ -594,14 +594,9 @@ export class Meta {
     } else {
       let listener = listeners[i];
 
-      // If the listener is our own function listener and we are trying to
-      // remove it, we want to splice it out entirely so we don't hold onto a
-      // reference.
-      if (
-        kind === ListenerKind.REMOVE &&
-        listener.kind !== ListenerKind.REMOVE &&
-        typeof method === 'function'
-      ) {
+      // If the listener is our own listener and we are trying to remove it, we
+      // want to splice it out entirely so we don't hold onto a reference.
+      if (kind === ListenerKind.REMOVE && listener.kind !== ListenerKind.REMOVE) {
         listeners.splice(i, 1);
       } else {
         assert(

packages/@ember/-internals/meta/tests/listeners_test.js

@@ -172,5 +172,33 @@ moduleFor(
         'one reopen call after mutating parents and flattening out of order'
       );
     }
+
+    '@test removed listeners are removed from the underlying structure GH#1112213'(assert) {
+      // this is using private API to confirm the underlying data structure is properly maintained
+      // and should be changed to match the data structure as needed
+
+      class Class1 {}
+      let class1Meta = meta(Class1.prototype);
+      class1Meta.addToListeners('hello', null, 'm', 0);
+
+      let instance1 = new Class1();
+      let m1 = meta(instance1);
+
+      function listenerFunc() {}
+
+      m1.removeFromListeners('hello', null, 'm', 0);
+
+      m1.addToListeners('stringListener', null, 'm', 0);
+      m1.addToListeners('functionListener', null, listenerFunc, 0);
+
+      m1.removeFromListeners('functionListener', null, listenerFunc, 0);
+      m1.removeFromListeners('stringListener', null, 'm', 0);
+
+      assert.equal(
+        m1.flattenedListeners().length,
+        1,
+        'instance listeners correctly removed, inherited listeners remain'
+      );
+    }
   }
 );