diff --git a/bench/main.c b/bench/main.c
index ae84614..cf8de59 100644
--- a/bench/main.c
+++ b/bench/main.c
@@ -99,7 +99,7 @@ iterations(char *s)
 		goto Bad;
 	errno = 0;
 	n = strtoumax(s, &end, 10);
-	if(errno != 0 || *end != '\0' || n == 0 || n > UINT64_MAX)
+	if(errno != 0 || *end != '\0' || n == 0)
 		goto Bad;
 	return n;
 Bad:
@@ -157,7 +157,7 @@ main(int argc, char **argv)
 
 	loadkeys(argv[1]);
 	niter = argc == 3 ? iterations(argv[2]) : 1000;
-	if(nkeys > UINT64_MAX || niter > UINT64_MAX / nkeys){
+	if(niter > UINT64_MAX / nkeys){
 		fprintf(stderr, "iteration count overflows key total\n");
 		exit(1);
 	}
diff --git a/str.c b/str.c
index 0e0f024..667012a 100644
--- a/str.c
+++ b/str.c
@@ -1,7 +1,8 @@
 #include "dat.h"
 #include "fn.h"
 
-/* Fills s from n bytes of UTF-8; whole, valid, and at most Maxrunes. */
+/* Fills s from n bytes of UTF-8; whole, valid, and at most Maxrunes.
+ * Anything else leaves s empty. */
 int
 sinit(Str *s, char *src, int n)
 {
@@ -35,8 +36,7 @@ stail(Str *s, char *src, int n)
 	nr = utfnlen(src, n);
 	for(p = src; nr > Maxrunes; nr--)
 		p += chartorune(&r, p);
-	if(!sinit(s, p, n - (p - src)))
-		sclear(s);
+	sinit(s, p, n - (p - src));
 }
 
 void