Fix overflow

clip.cpp

@@ -2592,7 +2592,7 @@ drawvec coalesce_polygon(drawvec const &geom) {
 				geom1 = coalesce_polygon(geom1);
 
 				std::vector<draw> geom2;
-				geom2.resize(i);
+				geom2.resize(geom.size() - i);
 				for (size_t k = i; k < geom.size(); k++) {
 					geom2[k - i] = geom[k];
 				}

tile.cpp

@@ -2333,7 +2333,7 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
 				if (p.clustered > 0) {
 					serial_val sv, sv2, sv3, sv4;
 					long long point_count = p.clustered + 1;
-					char abbrev[20];  // to_string(LLONG_MAX).length() / 1000 + 1;
+					char abbrev[30];
 
 					p.full_keys.push_back(key_pool.pool("clustered"));
 					sv.type = mvt_bool;