[Webkit-unassigned] [Bug 143239] No way to quickly make non-enumerable instance properties

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=143239

--- Comment #3 from Ryosuke Niwa <rniwa at webkit.org> ---
Accessing a property using symbol seems pretty fast (http://jsperf.com/symbol-vs-property/13):

symbol    18,871,149 ±0.94%  28% slower
property  18,106,575 ±0.42%  31% slower
.foo      26,093,814 ±0.53%  fastest

(Chrome results are somewhat misleading because it ran on a much faster results; what's important is the relative perf. of different cases).

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