Hi Tchadvar,
great news. Find nyefs datastore version which uses flexi-streams enclosed. I have not looked at it much, but it seems to contain good ideas (especially the define-object-codec macro looks cool). Maybe it helps having this.
Generally, flexi-streams make sense if the encoding of the log file and transaction logs are a problem - I really never looked at this hard enough. My applications all use Unicode strings with cmucl being ignorant about it. This is no pretty solution and I thought about switching to sbcl for the Unicode support, but I never made this happen.
Let me know if I can assist you further.
Best regards, Hans