Agreed. P4 is synonymous for Perforce. Did the project authors not do a cursory google first?
As for "unfortunately", what don't you like about it, apart from it not being what you're used to from elsewhere? I've used Visual Sourcesafe, Perforce and git, and Perforce seems like a perfectly decent source control system.
However, I won't deny that it would be nice to be able to manage multiple revisions locally so that I can explore different approaches and easily backtrack without having to commit to the central server.
The company I work at has Perforce tied to a homegrown code review tool that really makes it painful to use and in reality that's my main gripe with having to use it.
Right, it's not very fashionable, but both Google and MS are using Perforce for their own work... Normally the industry just slavishly imitates whatever Google does!
As for "unfortunately", what don't you like about it, apart from it not being what you're used to from elsewhere? I've used Visual Sourcesafe, Perforce and git, and Perforce seems like a perfectly decent source control system.
However, I won't deny that it would be nice to be able to manage multiple revisions locally so that I can explore different approaches and easily backtrack without having to commit to the central server.