Upon FAT repair, clean shutdown bit is not set

When a FAT repair is triggered, it is likely because the clean shutdown bit is not set. vfatlib is responsible for fixing the FS on disk.

But, the clean shutdown bit is not set once the repairing is done, and thus, FastFAT handles the volume as dirty, indefinitely even if clean.

Question being (for the fix): who's responsible for setting the clean shutdown bit on repair? FastFAT? vfatlib?