s2_options(), which now uses strings rather than numeric codes to specify boolean operation options, geography construction options, and builder options (#70).s2_rebuild() and s2_simplify(), which wrap the S2 C++ S2Builder class to provide simplification and fixing of invalid geographies (#70).s2_latlng() to s2_lnglat() to keep axis order consistent throughout the package (#69).s2_bounds_cap() and s2_bounds_rect() to compute bounding areas using geographic coordinates (@edzer, #63).s2_*_matrix() predicates now efficiently use indexing to compute the results of many predicate comparisons (#61).This version is a complete rewrite of the former s2 CRAN package, entirely backwards incompatible with previous versions.