User blog comment:Kirkburn/Technical Update: June 24, 2015/@comment-24473195-20150624200815/@comment-24473195-20150626163457

@DarthKitty:

That's interesting. Apparently, I had a module with the same name and same function available both on dev.wikia, and on my wikia, so it automatically uses a local module if it exists or returns an error if it doesn't. Changing it to "Dev:" like you say fixes the problem. I imagine this may trigger all sorts of strange bugs with similarly named modules. Perhaps in the future global modules should be named as "dev_modulename" to avoid such issues.

Anyway, the documentation needs to be updated I guess.