javascript - "use strict"; now allows duplicated properties? -


i found in last chrome 42 , ff 37.0.2 lines of code legal

"use strict"; var o = { p: 1, p: 2 };

(copy-pasted mdn )

in ie 10-11 , opera 28.0.1750 throws error expected.

in same time, 

abc=0;

causes error (undeclared variable) expected.

does know caused such change?

there bugzilla ticket here. gather (here , other pages have looked up), duplicate properties legal in ecmascript version 6, opposed es5, forbidden in strict mode.


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