A lot of good educations here! Thanks! The reason why I am making a copy of `this.props.payload.data.features`, mutating it, and then assigning it back to payload in line 107 is that if I understand correctly, changing in `this.props` will result in re-render. As we are only passing it to `getLayer` function and don't need it to be re-rendered, I copy it so `props` is unaffected and unnecessary re-render can be avoided. This is my understanding but I am not very sure whether it is correct based on your suggestion. Please correct me if I am wrong.
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