a5_bbox                 Bounding box of polygons with great-circle
                        edges
a5_cell                 A5 Cell Index Vector
a5_cell_child           The i-th child of each cell
a5_cell_children_range
                        Range of descendant cell ids
a5_cell_distance        Distance between cell centroids
a5_cell_from_arrow      Convert between a5_cell and Arrow uint64 arrays
a5_cell_list            List of A5 cell vectors
a5_cell_to_boundary     Get cell boundary polygons
a5_cell_to_boundary_xy
                        Get cell boundary vertices as flat coordinate
                        vectors
a5_compaction           Compact and uncompact sets of cells
a5_coordinates          Convert between coordinates and cells
a5_covering             A5 covering vectors
a5_covering_from_arrow
                        Convert between a5_covering and Arrow
                        list<uint64> arrays
a5_covering_measures    Measure coverings
a5_covering_predicates
                        Test coverings
a5_covering_stored      Stored cells of a covering
a5_covering_to_supercells
                        Supercells of a covering
a5_errors               Error classes
a5_get_res0_cells       Get all resolution-0 root cells
a5_get_resolution       Get the resolution of A5 cell indices
a5_grid_disk            Cells within k hops of a cell
a5_hierarchy            Index parents and children
a5_info                 a5R build and session information
a5_is_valid             Check that values are A5 cells
a5_line_string_to_cells
                        Cells traced by a great-circle linestring
a5_migrate              Migrate cell ids from the pre-1.0 index
a5_polygon_to_cells     Cells inside or overlapping a polygon
a5_resolution_stats     Cell size and counts by resolution
a5_set_operations       Combine coverings
a5_spatial_hierarchy    Supercells and subcells: parents and children
                        by location
a5_spherical_cap        Cells within a great-circle radius
a5_threads              Get or set the number of threads used by a5R
a5_to_arrow_table       Convert data frames with cell columns to and
                        from Arrow tables
a5_u64_to_hex           Coerce between hex strings and A5 cell vectors
wk_methods              wk methods for a5_cell
