I was thinking aliasing tail around partner -> tail coil just like e621, but then I read e621's wiki page , and it's a bit messy.

In short;
tail_coil is like tail_around_partner.
coiled_tail is the shape of a tail.
tail_coiled is empty, but should probably be the same as tail_coil.
tail_hug and hugging_tail is hugging own tail only.
tail_wraps is when there's clothes around the tail.
tail_wrapped is also tail_coil.
wrapped_tail is unaliased and empty.

What I'd do is this:
   • alias tail_coil and co to -> tail_around_partner (way clearer).
   • alias hugging_tail and co to hugging_own_tail.