mishoo/UglifyJS — pull request #413 by RGustBardon (2012-06-09 13:25:17+00:00)
Title: Use with_walkers without restoring previous state

This patch allows one to apply with_walkers without restoring
previously defined walkers. Such a restoration seems expendable
throughout the code base and affects the run-time performance.

For relevant discussion, please see issue #412.