The role of #include placement in .xcconfig files

It appears that when calling `Xcodeproj::Config::to_hash`, it first sets up the hash using all settings explicitly defined within that file and then afterwards merges in all the `#includes`. This would potentially override settings that have already been set, which is surprising because I'd expect it to work like an `#include` in a C file, where it's copy-pasting the contents of the included file at the exact point where it's included, rather than at the end. What is Xcode's actual behavior for this, and does it match what Xcodeproj does? If so, it'd be great to have a comment clarifying this.