Heading Normalizer

I thought of writing a module which can fix the heading usage (H1..H6 tags) in an input filter. The content you write (in a wysiwyg editor or using markdown for example) is generally starting with H1. Sometimes with another heading, but usually something wrong… I am (of course) not the first with this idea. It is already released, and it’s called Heading Normalizer. Surely something which all projects should use. And maybe even something which should be in core.