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By mswatcher
via 2ality.com
Published: Aug 23 2013 / 03:33

The conversion to boolean is different for historic reasons: For ECMAScript 1, it was decided to not allow objects to configure that conversion. The rationale was as follows. The boolean operators || and && preserve the values of their operands. Therefore, one may have to coerce the same object several times. That was considered a performance problem and led to the rejection.
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