class ActiveRecord::Relation::QueryAttribute

def infinite?
  infinity?(value_before_type_cast) || serializable? && infinity?(value_for_database)
end

def infinity?(value)
  value.respond_to?(:infinite?) && value.infinite?
end

def nil?
  unless value_before_type_cast.is_a?(StatementCache::Substitute)
    value_before_type_cast.nil? ||
      type.respond_to?(:subtype) && serializable? && value_for_database.nil?
  end
end

def type_cast(value)
  value
end

def unboundable?
  unless defined?(@_unboundable)
    serializable? { |value| @_unboundable = value <=> 0 } && @_unboundable = nil
  end
  @_unboundable
end

def value_for_database
  @value_for_database ||= super
end

def with_cast_value(value)
  QueryAttribute.new(name, value, type)
end