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It's nice to see a library use Closure Compiler's advanced compilation mode.

What's funny is that it hardly makes any difference. If you feed the source code into Closure in advanced mode, the size is 9258 bytes pre-gzip and 4109 post-gzip. In simple mode, the numbers are 9267 pre-gzip and ... also 4109 post-gzip! It was hardly worth the (relatively huge) effort to get the library working correctly in advanced mode.

BTW to get down to the final size of 4089, I compress the source code with Closure Compiler in Advanced Mode, and then compress again using UglifyJS to get rid of the last 20 bytes. Closure is not perfect...

That's mostly because its a library, and so most of the optimizations you're getting are purely local in-method and no dead-code pruning.

Where Closure shines is building an app whole-world, compiling both the client code, and library code together, then it can prune away all unused methods in the library.

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