[bugfix] updated pinned counts on status delete (#3188)

* include pinned status when incrementing / decrementing status counts

* remove the pinned increment on status creation

* code comments

* microoptimize decr

internal/util/math.go

@@ -23,6 +23,15 @@ type Number interface {
 		~uintptr | ~float32 | ~float64
 }
 
+// Decr performs a safe decrement of
+// n, clamping minimum value at zero.
+func Decr[N Number](n N) N {
+	if n <= 0 {
+		return 0
+	}
+	return n - 1
+}
+
 // Div performs a safe division of
 // n1 and n2, checking for zero n2. In the
 // case of zero n2, zero is returned.