fix: improve feature check and add missing patches

constant/features/cmfa.go

@@ -1,4 +1,5 @@
 //go:build cmfa
+
 package features
 
 func init() {

constant/features/low_memory.go

@@ -1,4 +1,5 @@
 //go:build with_low_memory
+
 package features
 
 func init() {

constant/features/tags.go

@@ -1,3 +1,11 @@
 package features
 
+import(
+	"golang.org/x/exp/slices"
+)
+
 var TAGS = make([]string, 0, 0)
+
+func Contains(feat string) (bool) {
+	return slices.Contains(TAGS, feat)
+}