of an instance. When using the attribute_will_change! method, you must
supply a string and not a symbol or the *_changed? method will break
(because it is looking for the attribute name as a string in the keys
of the underlying hash). To remedy this, I simply made the underlying
hash a HashWithIndifferentAccess so it won't matter if you supply
the attribute name as a symbol or string to attribute_will_change!.
* Clarifying what the #changed method returns
* Adding tests to describe what the #changed_attributes returns
* Updating test name based on pull request comment
* Moving the test lower in the file per pull request comment
When resetting an attribute, you expect it to return to the state it was
before any changes. Namely, this fixes this unexpected behavior:
~~~ruby
model.name = "Bob"
model.reset_name!
model.name_changed? #=> true
~~~
