Comment #4 on issue 2532 by [email protected]: Create Map object that
does not have __proto__ quirk
http://code.google.com/p/v8/issues/detail?id=2532
In addition to what Michael said, abusing objects as maps is a well-known
pitfall in JavaScript and the source for many bugs, for this and other
reasons. From ES6 on, that practice will be strongly discouraged in favour
of actual maps as a saner alternative. For ES5-, the recommendation you
often hear is to consistently mangle all key strings to avoid spurious
clashes with potential property names. (Even ES6 will mostly likely still
treat __proto__ in object literals specially, because everything else would
break the web.)
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