isolated nodes & self-connectivity

[ninbrm]

What happens with isolated nodes for the different metrics? This is intimately related to the topic of self-connectivity.
See for instance:
https://onlinelibrary.wiley.com/doi/10.1111/ele.12885
https://onlinelibrary.wiley.com/doi/10.1111/ele.12784
https://www.nature.com/articles/npre.2010.5356.1

[rafaqz]

@ninbrm this isn't written as an actionable issue... what was your idea to do about it?