Proposed significant breaking changes to Win32

There are some discussions going on in this issue: https://github.com/haskell/win32/issues/24 with proposals for extensive breaking changes to the Win32 library. Well over 100 functions would be involved. These changes would finally fix many long outstanding defects in the API, some of which make it impossible to use important Win32 functions in the way originally intended. I would generally support these proposals (after having seen that Neil supports them). But does anyone have any estimate of how much breakage it would cause on Hackage, or in the Windows builds of GHC? Thanks, Yitz