In the non-debug build, the compiler was free to align structs as it saw fit, in the debug build, it was told to pack them really tight, no padding. Why? The on

In the non-debug build, the compiler was free to align structs as it saw fit, in the debug build, it was told to pack them really tight, no padding. Why? The only reason I can think of is to save a few precious bytes of disk space.