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There are cases where var is still faster than let. In general, let is still not used in Node core. However, if performance is not suffering, I'd recommend let, especially if it's already written that way. I just saw a notification today in core that this should be fixed in future versions of v8, but that won't be available in Node for a few more months.
It's more of a question than an issue.
Would like to know if it is wise to change let variable to var in for loop due to v8 not optimizing it ?
If it is I can make pull requests to change this.
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