Added test cases for #104.
Signed-off-by: Justin Lau <justin@tclau.com>
Fixed typeof undefined optimization and updated related test case to
accomodates the sort behaviour changes made in commit
mishoo/UglifyJS2@aebafad41eab48f43ed649ce8c77e8f1528b50da.
Signed-off-by: Justin Lau <justin@tclau.com>
Better fix for equality of typeof ... against "undefined"