With steam trading being allowed now I think it would be nice if we could also trade humble bundle gift links.
When you create a gift link and someone clicks on it to claim it this is what you will be met with.

Once you've entered your email you will get this.

This should be no different than trading via steam in my opinion. If anyone has some reasons on why this shouldn't be allowed that I have not thought of please let me know.
If mediators were available these trades would be even more secure as they could enter in the email of the buyer and see for themselves that it was confirmed.