codegolf.stackexchange.com, I saw this and thought of you...
We start with the source-code markup you can see, remove comments, remove duplicate whitespace characters, and then apply minimum GZip compression. The Code-used measurement is the size in bytes of that GZip compressed source-code file.
Thanks to Brian Hurt for the idea of using size of compressed source code instead of lines of code.
Is there any reason that this wouldn't be considered sufficiently objective to be used in a winning criterion for golf-style questions?
What details would need to be specified to make it objective? Version, settings?
I had a brief glance at the existing tags, but please let me know if a relevant tag already exists or if there are already questions using this criterion which I have failed to find.