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Uglify2 doesn't support the value "some" anymore. Replace it with the `/^!/` regex which produces the same output as before. See https://build.trac.wordpress.org/changeset/35502 and https://build.trac.wordpress.org/changeset/35528. Fixes #34177. Built from https://develop.svn.wordpress.org/trunk@35564 git-svn-id: http://core.svn.wordpress.org/trunk@35528 1a063a9b-81f0-0310-95a4-ce76da25c4cd