From e790062751f6abed9aae94c7978da052f1083b06 Mon Sep 17 00:00:00 2001
From: Matthieu Foucault <foucault.matthieu@gmail.com>
Date: Fri, 23 Sep 2016 14:03:09 -0700
Subject: [PATCH 1/3] Add test showing bug: middleware throws if there is a NaN
 in the state

---
 test/index.spec.js | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/test/index.spec.js b/test/index.spec.js
index dbe46ca..ddae1ed 100644
--- a/test/index.spec.js
+++ b/test/index.spec.js
@@ -84,4 +84,15 @@ describe('immutableStateInvariantMiddleware', () => {
       dispatch({type: 'SOME_ACTION', x});
     }).toNotThrow();
   });
+
+  it('works correctly with NaN', () => {
+    const next = action => action;
+
+    const dispatch = middleware(next);
+
+    state = {foo: NaN};
+    expect(() => {
+      dispatch({type: 'SOME_ACTION'});
+    }).toNotThrow();
+  })
 });

From b21595635a88d3c4e8223f2bb7203c140415fb72 Mon Sep 17 00:00:00 2001
From: Matthieu Foucault <foucault.matthieu@gmail.com>
Date: Fri, 23 Sep 2016 14:14:08 -0700
Subject: [PATCH 2/3] Ensure the middleware doesn't throw if obj is a NaN

---
 src/trackForMutations.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/trackForMutations.js b/src/trackForMutations.js
index 9357af1..751d460 100644
--- a/src/trackForMutations.js
+++ b/src/trackForMutations.js
@@ -25,7 +25,7 @@ function detectMutations(isImmutable, trackedProperty, obj, sameParentRef = fals
 
   const sameRef = prevObj === obj;
 
-  if (sameParentRef && !sameRef) {
+  if (sameParentRef && !sameRef && !Number.isNaN(obj)) {
     return { wasMutated: true, path };
   }
 

From dd32c346f3fcfbbed31918da2c0359afb2451358 Mon Sep 17 00:00:00 2001
From: Matthieu Foucault <foucault.matthieu@gmail.com>
Date: Fri, 30 Sep 2016 10:29:07 -0700
Subject: [PATCH 3/3] Move the test into the proper file

---
 test/index.spec.js             | 11 -----------
 test/trackForMutations.spec.js |  4 ++++
 2 files changed, 4 insertions(+), 11 deletions(-)

diff --git a/test/index.spec.js b/test/index.spec.js
index ddae1ed..dbe46ca 100644
--- a/test/index.spec.js
+++ b/test/index.spec.js
@@ -84,15 +84,4 @@ describe('immutableStateInvariantMiddleware', () => {
       dispatch({type: 'SOME_ACTION', x});
     }).toNotThrow();
   });
-
-  it('works correctly with NaN', () => {
-    const next = action => action;
-
-    const dispatch = middleware(next);
-
-    state = {foo: NaN};
-    expect(() => {
-      dispatch({type: 'SOME_ACTION'});
-    }).toNotThrow();
-  })
 });
diff --git a/test/trackForMutations.spec.js b/test/trackForMutations.spec.js
index 311d0b9..30c78da 100644
--- a/test/trackForMutations.spec.js
+++ b/test/trackForMutations.spec.js
@@ -226,6 +226,10 @@ describe('trackForMutations', () => {
       fn: (s) => {
         return {...s, foo: {}};
       }
+    },
+    'having a NaN in the state': {
+      getState: () => ({ a:NaN, b: Number.NaN }),
+      fn: (s) => s
     }
   };