Commented Issue: Action selection requires a default value on a parameter even when the parameter is marked as optional [966]

This is especially an issue for attribute routing:

[HttpGet("{id?}")]
public string Get(string id) { }

doesn't work unless you add a default value

[HttpGet("{id?}")]
public string Get(string id = null) { }
Comments: We decided to revert this fix in favor of bug https://aspnetwebstack.codeplex.com/workitem/1284