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In Array.prototype.toString, the size of the output string is calculated by iterating through the this Array, and adding the length of each element to an integer variable. If the Array contains very long strings, this integer can overflow and become a smaller value than the combined length of the strings. Then, the output string is allocated with this length, and when each string is copied into the output string, the buffer is too small, and some strings are copied out of bounds.
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