#### Expected behavior vs actual behavior
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#### Steps to reproduce
*(e.g., detailed walkthrough, runnable script, example application)*
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#### Environment

ActiveModelSerializers Version *(commit ref if not on tag)*: 

Output of `ruby -e "puts RUBY_DESCRIPTION"`: 

OS Type & Version: 

Integrated application and version *(e.g., Rails, Grape, etc)*: 
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#### Backtrace
*(e.g., provide any applicable backtraces from your application)*
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#### Additonal helpful information
*(e.g., Gemfile.lock, configurations, PR containing a failing test, git bisect results)*
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