docs(select): add note about breaking change with numeric values

Closes angular#12052

Author: Narretz

CHANGELOG.md

@@ -1209,7 +1209,22 @@ But in practice this is not what people want and so this change iterates over pr
 in the order they are returned by Object.keys(obj), which is almost always the order
 in which the properties were defined.
 
+- **select:** due to [7fda214c](https://github.com/angular/angular.js/commit/7fda214c4f65a6a06b25cf5d5aff013a364e9cef),
 
+the `select` directive will now use strict comparison of the `ngModel` scope value against `option`
+values to determine which option is selected. This means `Number` scope values will not be matched
+against numeric option strings.
+Previously, setting `scope.x = 200` would select the `option` with the value 200 in the following `select`:
+
+```
+<select ng-model="x">
+  <option value="100">100</option>
+  <option value="200">200</option>
+</select>
+```
+
+To remedy this, you can either initialize the model as a string - `scope.x = '200'` - or implement a
+parser on `ngModel` that converts the `option` string value to a `Number`.
 
 <a name="1.3.9"></a>
 # 1.3.9 multidimensional-awareness (2015-01-13)

docs/content/guide/migration.ngdoc

@@ -136,7 +136,7 @@ class based animations (animations triggered via ngClass) in order to ensure tha
 
 
 
-## Forms (`ngMessages`, `ngOptions`)
+## Forms (`ngMessages`, `ngOptions`, `select`)
 
 ### ngMessages
 The ngMessages module has also been subject to an internal refactor to allow it to be more flexible
@@ -190,6 +190,25 @@ in the order they are returned by Object.keys(obj), which is almost always the o
 in which the properties were defined.
 
 
+### select
+
+Due to [7fda214c](https://github.com/angular/angular.js/commit/7fda214c4f65a6a06b25cf5d5aff013a364e9cef),
+
+the `select` directive will now use strict comparison of the `ngModel` scope value against `option`
+values to determine which option is selected. This means `Number` scope values will not be matched
+against numeric option strings.
+Previously, setting `scope.x = 200` would select the `option` with the value 200 in the following `select`:
+
+```
+<select ng-model="x">
+  <option value="100">100</option>
+  <option value="200">200</option>
+</select>
+```
+
+To remedy this, you can either initialize the model as a string - `scope.x = '200'` - or implement a
+parser on `ngModel` that converts the `option` string value to a `Number`.
+
 ## Templating (`ngRepeat`, `$compile`)
 
 ### ngRepeat