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class Object
# A duck-type assistant method. For example, Active Support extends Date
# to define an acts_like_date? method, and extends Time to define
# acts_like_time?. As a result, we can do "x.acts_like?(:time)" and
# "x.acts_like?(:date)" to do duck-type-safe comparisons, since classes that
# we want to act like Time simply need to define an acts_like_time? method.
def acts_like?(duck)
respond_to? :"acts_like_#{duck}?"
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