Don't rely on default array initialization, not only it may not work with some really old compilers (which is actually not that important as we don't seem to rely on these arrays being initialized, in fact), but it results in warnings about working correctly (sic) from MSVC in versions from 9 up to 12 inclusive. See https://github.com/wxWidgets/wxWidgets/pull/467#issuecomment-310193867