Fixed boneheaded mistake with checking assertion types

nfa.go

@@ -34,12 +34,10 @@ func (s State) contentContains(str []rune, idx int) bool {
 		return idx == len(str)
 	}
 	if s.assert == WBOUND {
-		if s.assert == WBOUND {
-			return isWordBoundary(str, idx)
-		}
-		if s.assert == NONWBOUND {
-			return !isWordBoundary(str, idx)
-		}
+		return isWordBoundary(str, idx)
+	}
+	if s.assert == NONWBOUND {
+		return !isWordBoundary(str, idx)
 	}
 	// Default - s.assert must be NONE
 	return slices.Contains(s.content, int(str[idx]))