Include this Module for Value Object semantics
The idea is that instances should be immutable and compared based on state
(rather than identity, as is typically the case)
@example
class GeoLocation include Virtus::ValueObject attribute :latitude, Float attribute :longitude, Float end location = GeoLocation.new(:latitude => 10, :longitude => 100) same_location = GeoLocation.new(:latitude => 10, :longitude => 100) location == same_location #=> true hash = { location => :foo } hash[same_location] #=> :foo
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