Documentation: Emphasize how important is :key in v-for

I have had an error in production that was giving me phantom behaviour in a v-for for 6 months. I tried to reproduce it with the computer and everything was fine. Today investigating, I reread the explanation about how important the :key attribute was on the v-for.
Could anyone mark in red that using the index provided in the same v-for is a terrible idea, the :key needs a unique key.


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Will do!

If it makes you feel any better, I fell victim to the same thing :slightly_smiling_face:

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