Feel little sorry for this question.For refine my answer here, I have done some dig about
ArrayComponents.Then I found
Internal`ToEquivalenceClass here today. Actually I meet it many time before this in those defined page. Maybe it cannot help to improve my solution.I have to say,it is maybe a more curious as m_goldberg blamed but not for some certain intention. I have recited almost all built-in function in Mathematica,I just want to find out some new thing to study.
And this comment hint the
Internal`* function is useless for user(maybe just usefull developer).But as we know,such as
Internal`Bag or other things have a good exposure rate in MMA.SE.I think the SE is a place to discuss openly.If someon else also are interested in those undocumented function like me. we can dig and discuss it together. If it wast somebody's time,it not my intention indeed..