Unexpected result of parsing xcconfig files

[PhilCai]

For example, the OTHER_LDFLAGS in the xcconfig file looks like below:

...
OTHER_LDFLAGS=$(inherited) -ObjC -filelist $(PODS_ROOT)/Pods-MyApp.xcconfig.LinkFile.list -l"IGListKit" -l"Whatever"
...

And after parsing xcconfig using Xcodeproj::Config, the items of OTHER_LDFLAGS are out of order.

(Maybe we shouldn't use Set and sort here:https://github.com/CocoaPods/Xcodeproj/blob/master/lib/xcodeproj/config.rb#L124)

XCCONFIG = Xcodeproj::Config.new("path/to/myapp.xcconfig")
other_linker_flags = XCCONFIG.other_linker_flags
simple = other_linker_flags[:simple]
puts "simple", simple
puts "OTHER_LDFLAGS", XCCONFIG.to_hash["OTHER_LDFLAGS"]

simple
#<Set: {"$(inherited)", "-ObjC", "-filelist", "$(PODS_ROOT)/Pods-MyApp.xcconfig.LinkFile.list"}>
OTHER_LDFLAGS
$(PODS_ROOT)/Pods-MyApp.xcconfig.LinkFile.list $(inherited) -ObjC -filelist -l"IGListKit" -l"Whatever"

Expected:

$(inherited) -ObjC -filelist $(PODS_ROOT)/Pods-MyApp.xcconfig.LinkFile.list $(inherited) -ObjC -filelist -l"IGListKit" -l"Whatever" -l"IGListKit" -l"Whatever"