I see that most of the pallets are annotated as
#[frame_support::pallet], but some of them are
#[frame_support::pallet(dev_mode)] and my question is what exactly means
dev-mode in the context of the annotation/pallet? Does it (in any way) help for delivering source code of a pallet?
To answer that question, I was looking at the documentation and was looking at Substrate code per se, but did not found exact answer. Of course, I have some guesses, but only empty guesses.