libgit2/libgit2 — comment on commit 450b40cab39c786bf67e7491755e7d0b3a4dc3ba
File: src/filter.c line 139
By arrbee:

Doesn't matter that much, I think, but the intent of the attr.h header is for you to use GIT_ATTR_TRUE instead of directly referencing git_attr__true so that the implementation could be changed in the future. Obviously this is internal to the library, so it doesn't really matter one way or the other.