Constant proj_sys::PROJ_GRID_AVAILABILITY_USE_PROJ_GRID_AVAILABILITY_USED_FOR_SORTING

pub const PROJ_GRID_AVAILABILITY_USE_PROJ_GRID_AVAILABILITY_USED_FOR_SORTING: PROJ_GRID_AVAILABILITY_USE = 0;

Grid availability is only used for sorting results. Operations where some grids are missing will be sorted last.