ScriptableObject.CreateInstance vs. Optional Arguments

Unity Engine
1

I stumbled upon something weird:

namespace MyStuff
{
	[System.Serializable]
	public class MyClass : ScriptableObject
	{
		public void doSomething(bool flag = false)
        {
		}
	}
}

As soon as I try to create an instance using

MyClass mc = ScriptableObject.CreateInstance<MyClass>();

there is an error:
Instance of MyClass couldn't be created because there is no script with that name.

The fix appears to be making ‘flag’ non optional. Why is that? I’m on 4.1.2.f1

EDIT: Removing the namespace also fixes it.

2

Took me about 2 hours to figure this out, but I can confirm that having an optional parameter in a method in a ScriptableObject causes it to have weird serialization issues (i.e. saving it as an asset and trying to delete it will crash Unity "The file ‘MemoryStream’ is corrupted! Remove it and launch Unity again).

Seems like a Unity bug. I’ve reported it.