So it will compile faster. For example, the unittests should be moved to object.d.
This will not make a significant difference. .di files almost never do.
I'm excited to see the benchmarks showing the faster compile times!
See the link here for some empirical analysis: https://forum.dlang.org/post/qhpilpyuiptlvlajoczr@forum.dlang.org There is no reason to believe that changing the filename will improve anything, so closing this as invalid.