larger seenmask has no advantage

src/gen_dcs_classifier.pl

@@ -755,15 +755,7 @@ _VCL (F_CLASSIFIER_H, VCL_TOP, <<EOF);
 /* tunable */
 #define DCS_MAX_NEGMATCH_CAND	32
 
-/*
- * we need a huge bitmask to mark which subkeys we have seen already in order to
- * avoid the effort of marking subkeys in the matchmask of potentially many
- * entries. As, for all practical purposes, this bitmask will always be larger
- * than any machine data type, we want to use the largest machine data type for
- * which native machine operators exist. This should be a long int
- * https://usrmisc.wordpress.com/2012/12/27/integer-sizes-in-c-on-32-bit-and-64-bit-linux/
- */
-typedef unsigned long int dcs_seenmask_t;
+typedef unsigned char dcs_seenmask_t;
 
 
 /* values for the particular dcs db use to generate this code */