Ruby：有没有方法attr_initialize的宝石？

attr_initialize :attr1, :@attr2, [:@attr3, 1] do |arg4|
  post_initialization(arg4)
end

attr_accessor :attr1

def initialize(attr1, attr2, attr3 = 1, arg4 = nil)
  @attr1 = attr1
  @attr2 = attr2
  @attr3 = attr3
  post_initialization(arg4)
end

attr_accessor :attr1, :attr2, :attr3

def initialize(*attrs)
  @attr1, @attr2, @attr3 = attrs
  post_initialization attrs.last
end