unsorted lists can become sorted after removal

The old code only set the list to sorted when the lists size was <= 1
after the removal.

primitiveCollections/src/main/java/org/lucares/collections/IntList.java

@@ -334,7 +334,12 @@ public final class IntList implements Serializable, Cloneable {
 
 		size = size - (toIndex - fromIndex);
 
-		sorted = size() <= 1 ? true : sorted; // lists of size 1 or smaller are always sorted
+		if (!sorted) {
+			sorted = true;
+			for (int i = 1; i < size && sorted; i++) {
+				sorted = data[i - 1] <= data[i];
+			}
+		}
 	}
 
 	/**
@@ -384,7 +389,12 @@ public final class IntList implements Serializable, Cloneable {
 		}
 		size = insertPosition;
 
-		sorted = size() <= 1 ? true : sorted; // lists of size 1 or smaller are always sorted
+		if (!sorted) {
+			sorted = true;
+			for (int i = 1; i < size && sorted; i++) {
+				sorted = data[i - 1] <= data[i];
+			}
+		}
 	}
 
 	/**