Shouldn't the condition be changed to include 0. Either ">= 0" or "< 0" with statements swapped?

In T46872#348440, @Sergey Sharybin (sergey) wrote:

In my experience working on open movies, node groups aren't that heavily used actually, so for them such optimization wouldn't give much benefit.

That may be true for artists working on a final shader for rendering, but for creating procedural textures and other complexities to be used by those artists, node groups are essential. For procedurals alone, this patch is a godsend.

+1 as well. This definitely needs to be fixed. Lost data = lost time and money.

The builds on dropbox are inaccessible. Error (509): This account's public links are generating too much traffic and have been temporarily disabled!
By chance I found the windows build reposted by liquidape on polycount here.