What do you mean by "short circuit"?
It means that the part after ||
will only be evaluated if it is needed know the result of the operator. In the case of the or-operator the second half is redundant if the first is true, since the total will be true no matter what the second part is.
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| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||