Add TLS trick config options

lib/core/model/range.dart

@@ -0,0 +1,45 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'range.freezed.dart';
+
+@freezed
+class RangeWithOptionalCeil with _$RangeWithOptionalCeil {
+  const RangeWithOptionalCeil._();
+
+  const factory RangeWithOptionalCeil({
+    required int min,
+    int? max,
+  }) = _RangeWithOptionalCeil;
+
+  String format() => "$min${max != null ? "-$max" : ""}";
+
+  factory RangeWithOptionalCeil.fromString(String input) =>
+      switch (input.split("-")) {
+        [final String min] => RangeWithOptionalCeil(min: int.parse(min)),
+        [final String min, final String max] => RangeWithOptionalCeil(
+            min: int.parse(min),
+            max: int.parse(max),
+          ),
+        _ => throw Exception("Invalid range: $input"),
+      };
+
+  static RangeWithOptionalCeil? tryParse(String input) {
+    try {
+      return RangeWithOptionalCeil.fromString(input);
+    } catch (_) {
+      return null;
+    }
+  }
+}
+
+class RangeWithOptionalCeilJsonConverter
+    implements JsonConverter<RangeWithOptionalCeil, String> {
+  const RangeWithOptionalCeilJsonConverter();
+
+  @override
+  RangeWithOptionalCeil fromJson(String json) =>
+      RangeWithOptionalCeil.fromString(json);
+
+  @override
+  String toJson(RangeWithOptionalCeil object) => object.format();
+}