In the preferences one can switch on (or off) compression and in Bl 2.49 there is a big reduction in needed space. (from about 400 KB .blend to about 50 KB)
In Bl 2.53 SVN 31574 a blend with only the default Cube the saved .blend does not change size with or without compression? (stays around 452 KB)
Is it a bug or something else a missing ‘switch’ in user-config.py (for self compilation)?