Routing is matching empty segments to parameters and defaults are wrong

[rynowak]

Consider the following:

    public class ValuesController : Controller
    {
        [HttpGet("{a=a}/{b=b}/{c=c}")]
        public string Get(string a, string b, string c)
        {
            return $"{a} - {b} - {c}";
        }
    }

This should match a url like / or /10 or /10/20 or /10/20/30

However with a URL like ///hi this will match. And the output will be b - c - hi. That is, the parameter a gets the default value b and is able to match an empty string.

[Eilon]

Let's add like a million tests for these cases...

[Eilon]

Done?