What is the naming convention for using traits in a Zend Framework project?

My_Form_Element_Traits or My_Form_Element_Trait?

I am thinking plural as it's a collection of methods and properties, however on the other hand it is one trait.

I also thought that maybe there are different traits I want to use so maybe it should be My_Form_Element_Traits_Preference

What is the best practice hear to this new feature?

php zend-framework naming-conventions traits
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