What is the behaviour when lsl is used with an expand-down descriptor? Will it load the same value as the full limit field in an expand-up descriptor? (in other words: just take the limit fields concatenated or (limit fields concatenated shl 12) or fffh)

Or does it return something different than the limit field with top-down segments? So what does http://www.sudleyplace.com/dpmione/expanddown.html mean when saying:

For reference, the LSL instruction would return 0FFFh for the Expand Up segment and 0FFFFEFFFh for the Expand Down segment.

So will lsl load ffffh/ffffffffh-(limit+1), depending on it's granularity? Or just the same value as if the expand down bit wasn't set?