Object.defineProperty, but not IE 8's broken one.
Object.defineProperty
没有声明运行依赖。
^21.1.1
^0.2.2
^1.0.3
^5.6.5
^2.5.0
^0.1.13
^8.8.0
^0.0.19
^1.2.0
^2.0.1
^0.3.1
^10.3.2
^2.0.0
^5.9.0
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