Trying to balance the utility of markdown formatting against readability, (as the inline link style introduced in v2.2 isn't necessarily that readable), I've decided to introduce a new field, REFLINK, for storing reference-style links. The notion being that this permits simple cut and paste (using those reflinks), while preserving the necessary link information elsewhere.
I've also decided to relax about the inclusion of simple markdown formatting – as it's a hassle to remove it, I'm not going to worry about whether or not it's present. Sure, it results in storing extraneous metadata (since the markdown characters don't get expressed by any audio players, except as unnecessary ascii characters), but in the scheme of things, it's not going to add much to the file size.
Un-deprecated ABBR – although it's impossible to make a unique assignment for every possible ARTIST (too many artists, not enough characters), as convenient shorthand, I'd prefer to read short filenames than long ones, and using ABBR is one way to accomplish this in an efficient manner.