# File lib/virtus/attribute.rb, line 36
    def self.coerce(value = Undefined)
      Virtus.warn "#{self}.coerce is deprecated and will be removed in 1.0.0. Use Virtus.coerce instead: ##{caller.first}"
      return Virtus.coerce if value.equal?(Undefined)
      Virtus.coerce = value
      self
    end