Question: Who coined the term "steelman" or "steelmanning", and when?
I was surprised not to find it in the wiki, but the term is gaining currency outside LessWrong.
Also, I'd be surprised if the concept were new. Are there past names for it? Principle of charity is pretty close, but not as extreme.
Google search with a date restriction and a few other tricks to filter out late comments on earlier blog posts suggests Luke's post Better disagreement as the first online reference, though the first widely linked reference is quite recent, from the Well Spent Journey blog.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.