Recently after switching branches in my SLIME Git repo

I caught a message about slime/swank versions inconsistence.

Presently SLIME urges to recompile slime.el if slime.elc is found

and it older the slime.el, but it does not reloads slime.el automatically

if it has been changed. The first solution which comes to the mind

is the store md5 hashsum of the current slime.el and check it

every time of SLIME loading. Thoughts?