use uint8_t for endpoint

include/r3.h

@@ -43,7 +43,6 @@ struct _node {
     uint32_t      edge_cap;
     uint32_t      route_len;
     uint32_t      route_cap;
-    int           endpoint;
 
     /** compile-time variables here.... **/
 
@@ -60,6 +59,7 @@ struct _node {
      */
     void * data;
 
+    uint8_t       endpoint;
 };
 
 struct _edge {

tests/bench_str.csv

@@ -433,3 +433,9 @@
 1400606523,13157029.51
 1400606567,13999364.95
 1400747045,12800263.03
+1400747100,13777027.60
+1400747522,8879185.36
+1400747540,13340093.01
+1400747551,13646625.52
+1400747590,13236559.80
+1400747616,13166578.53