Alternatives to RegExpParseMode since 4.9.0

[lekrus]

There was an issue #2161 with NullReferenceException that was resolved by setting

new Parser(ParserOptions.Default with { RegExpParseMode = RegExpParseMode.AdaptToInterpreted })

With upgrade to 4.9.0 that code now throws:

System.InvalidCastException: Unable to cast object of type 'RegExpCapturingGroup[]' to type 'RegexConversionOptions'.
    at Jint.Runtime.Interpreter.Expressions.JintLiteralExpression.ResolveValue(EvaluationContext context)

RegExpParseMode itself is marked as obsolete, so it's necessary to use OnRegExp instead, however, the default Engine.DefaultConvertRegExpHandler used by engine is internal, so cannot be used.

The workaround found is to use the following code:

var engine = new Engine();
var obj = new JsObject(engine);
var proto = new JsObject(engine);
var source = "function() { return \"test\".match(/[a-z]/)?.[0]; }";
var prepared = Engine.PrepareScript("(" + source + ")");
var getterFunction = (IFunction)((ExpressionStatement)prepared.Program?.Body[0])?.Expression;
var getter = new ScriptFunction(
	engine,
	getterFunction,
	true, proto
);

var propDesc = new GetSetPropertyDescriptor(getter, null, true, false);
obj.DefineOwnProperty("name", propDesc);

Is there any other way (more efficient) to prepare custom getter functions via code?