Note that LINEAR_PROBES can be set to zero.
diff --git a/Objects/setobject.c b/Objects/setobject.c
index 22d9cb3..adc99da 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -43,7 +43,7 @@
/* ======================================================================== */
/* ======= Begin logic for probing the hash table ========================= */
-/* This should be >= PySet_MINSIZE - 1 */
+/* Set this to zero to turn-off linear probing */
#ifndef LINEAR_PROBES
#define LINEAR_PROBES 9
#endif