ExtensionMethod is used even if matching prototype method exists

[windischb]

I'm not sure if this is a bug or i'm just confused....
I have an ExtensionMethod in C#:

    public static class StringExtensions
    {
        public static string[] Split(this string value, string split, StringSplitOptions options)
        {
            return new string[0];
        }
    }

which i added to the Jint Options:

var engine = new Engine(opts =>
{
    opts.AddExtensionMethods(typeof(StringExtensions));
});
var arr = engine.Execute("'yes,no'.split(',')").GetCompletionValue().AsArray();

Here i get an exception, because Jint wants to use the ExtensionMethod, but missing some Arguments.
Shouldnt jint uses the "builtin" javascript split Method before trying to invoke the extensionMethod?

github test repo: https://github.com/windischb/JintTest