You can send whatever you like to `W(neighbors, ids='garbage')`, because it's never used. This is the genesis of many bugs in the past & present. ```python W({1:[2,3], 2:[3], 3:[2]}, ids="If you're reading this, something's up!") ``` It looks like it's never actually been plugged in anywhere. Back in [3ef349](https://github.com/pysal/libpysal/commit/3ef349d6241b5909fa80fe4026a7cd57140c0bb5), it was added, but never used anywhere afaict? This really needs to be cleaned up once and for all, I think.