Why is there no general implementation of OrderedDictionary?

Why is there no general implementation of OrderedDictionary?

Before sending this message, I saw: No common implementation of OrderedDictionary?

But this only confirms that this does not exist. Not why it does not exist.

There are several custom implementations I have seen, including: http://www.codeproject.com/KB/recipes/GenericOrderedDictionary.aspx

But why didn't Microsoft include it in the .net core library? Surely they had a reason not to build a common ... but what is it?

thanks

EDIT: Perhpase this should be ported to programers.se.com ... but I don't know how to move it.

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