Fix bug where Result.Raw of literal 'false' was 'f'

gjson.go

@@ -511,7 +511,7 @@ func tonum(json string) (raw string, num float64) {
 
 func tolit(json string) (raw string) {
 	for i := 1; i < len(json); i++ {
-		if json[i] <= 'a' || json[i] >= 'z' {
+		if json[i] < 'a' || json[i] > 'z' {
 			return json[:i]
 		}
 	}

gjson_test.go

@@ -1101,3 +1101,12 @@ func TestGetMany48(t *testing.T) {
 		}
 	}
 }
+
+func TestResultRawForLiteral(t *testing.T) {
+	for _, lit := range []string{"null", "true", "false"} {
+		result := Parse(lit)
+		if result.Raw != lit {
+			t.Fatalf("expected '%v', got '%v'", lit, result.Raw)
+		}
+	}
+}