Make this property enabled by default and remove from preferences dialog, it can still be disabled via Settings Editor.
Created attachment 7930 patch
Of course, we need to update the documentation once this get pushed.
Andre Miranda referenced this bugreport in commit bf0c2ae96a20d0cf1caa4297e5d7ef82a31f648c Show file size in binary units by default (Bug #14653) https://git.xfce.org/xfce/thunar/commit?id=bf0c2ae96a20d0cf1caa4297e5d7ef82a31f648c
Andre Miranda referenced this bugreport in commit e9342c768d6611d7301804f5e1d599d61e8950cc Show file size in binary units by default (Bug #14653) https://git.xfce.org/xfce/thunar/commit?id=e9342c768d6611d7301804f5e1d599d61e8950cc
After discussing with Alex, we decided to push file sizes in binary format as default but keep the toggle in preferences. Rationale: browsers show files size in binary base, commands such as ls and du too (altought they round up), even Windows!