diff --git a/c/input/lrec_reader_mmap_csv.c b/c/input/lrec_reader_mmap_csv.c
index d9829f6e8..7b8a0a916 100644
--- a/c/input/lrec_reader_mmap_csv.c
+++ b/c/input/lrec_reader_mmap_csv.c
@@ -370,7 +370,8 @@ static lrec_t* paste_header_and_data(lrec_reader_mmap_csv_state_t* pstate, rslls
 	sllse_t* ph  = pstate->pheader_keeper->pkeys->phead;
 	rsllse_t* pd = pdata_fields->phead;
 	for ( ; ph != NULL && pd != NULL; ph = ph->pnext, pd = pd->pnext) {
-		lrec_put(prec, ph->value, pd->value, pd->free_flag);
+		//lrec_put(prec, ph->value, pd->value, pd->free_flag);
+		lrec_put_no_free(prec, ph->value, pd->value);
 		pd->free_flag = 0;
 	}
 	return prec;
diff --git a/c/lib/mlrutil.c b/c/lib/mlrutil.c
index 0a09e7a2b..fd7277707 100644
--- a/c/lib/mlrutil.c
+++ b/c/lib/mlrutil.c
@@ -62,7 +62,7 @@ void* mlr_malloc_or_die(size_t size) {
 		fprintf(stderr, "malloc(%lu) failed.\n", (unsigned long)size);
 		exit(1);
 	}
-	//fprintf(stderr, "size=%d,p=%p\n", (int)size, p);
+	//fprintf(stderr, "MALLOC size=%d,p=%p\n", (int)size, p);
 	return p;
 }
 
@@ -73,6 +73,7 @@ void* mlr_realloc_or_die(void *optr, size_t size) {
 		fprintf(stderr, "realloc(%lu) failed.\n", (unsigned long)size);
 		exit(1);
 	}
+	//fprintf(stderr, "REALLOC size=%d,p=%p\n", (int)size, nptr);
 	return nptr;
 }
 
diff --git a/c/lib/mlrutil.h b/c/lib/mlrutil.h
index 99a6f9d65..6560f199e 100644
--- a/c/lib/mlrutil.h
+++ b/c/lib/mlrutil.h
@@ -76,6 +76,7 @@ static inline char * mlr_strdup_or_die(const char *s1) {
 		fprintf(stderr, "malloc/strdup failed\n");
 		exit(1);
 	}
+	//fprintf(stderr, "STRDUP size=%d,p=%p\n", (int)strlen(s2), s2);
 	return s2;
 }
 
diff --git a/c/todo.txt b/c/todo.txt
index eb51aa80f..dc13a204a 100644
--- a/c/todo.txt
+++ b/c/todo.txt
@@ -25,14 +25,15 @@ TOP OF LIST
 MAJOR: csv mem-leak/read-perf
 
 * current option runs faster w/o free, apparently due to heap-fragging
-  ! malloc-trace ... verify heap-frag hypothesis for fp-csv reader.
-  ! mmap vopen/vclose -> api, for unit-testability. & x all readers.
-  ! eliminate string-builder except where necessary
-  ! reusable_slls: x both csv and both csvlite readers; xtab too?
-  ! eofpoke in wrapper vopen
-  o memory leak in csv reader! careful about slls data, and do not use lrec_put_no_free
+  ~ malloc-trace ... verify heap-frag hypothesis for fp-csv reader.
+  ? mmap vopen/vclose -> api, for unit-testability. & x all readers.
+  k eliminate string-builder except where necessary
+  * in mmap-csv, try harder to not use the psb even in the dquoted case
+  k reusable_slls: x both csv and both csvlite readers; xtab too.
+  k eofpoke in wrapper vopen
+  ! rethink lrec_put/lrec_put_no_free entirely. 1st get timings for all filetypes.
   o redo inline-pasting but this time correctly weight the fragging effect
-  o power-of-two
+  o power-of-two ...
 * for stdio, needs some thought ...
 * ... but for mmap, it's almost always not necessary to strdup at all:
   only on escaped-double-quote case.