Use io.github for ID example

[TingPing]

Github very specifically puts all user hosted websites under github.io as its a completely different domain than github.com which controls all officially hosted websites.

Using io.github for an ID makes it explicitly clear it is not associated with an official Github project which certainly could be packaged.

[ximion]

This is true for projects, but http://ximion.github.io/ does not exist, but https://github.com/ximion/ does.
Could someone else create a ximion.github.io project and thereby create name ambiguity? Or is that not permitted?

[TingPing]

No $name.github.io can only be created by that User/Organization.

[ximion]

I could create a repo with that name, but looks like I can't deploy it.
So in that case, using io. is fine :-)