[core.reflect] showcase fqn

[russhy]

Impressive results!

I wasn't sold initially, but that was because i didn't know what 
it was exactly, this totally is game changer

  __traits is nice for simple stuff, but as soon as you try to do 
more complex logic it starts to become unmanageable, and i never 
remember the exact syntax, hopefully ``core.reflect`` will solve 
that, and so far looks like it's already set to replace __traits 
fully