The title says it all, really. I'd like to use an arrow that looks exactly like an "upside down
\hookrightarrow" in a diagram (for which I'm using
tikz-cd), but I am really not comfortable enough with the nitty-gritty details of defining arrows that play nice with the extensibility etc. requirements of
tikz-cd to define such a thing by myself.
More generally, an answer that explains how to edit a pre-existing arrow (or create a new one entirely?!) that will work properly in
tikz-cd would be welcome.