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We have less dynamic arrays in the code base now so let's start warning for all the cases where we pass dynamic arrays without keys. I use the displayName to point out which component's render method was responsible. I only warn once per component. If the child was created in a different component (and passed as a property) I also show the owner of the child. Maybe it should've attached the key at a higher level. This does give false positives for arrays that are truly static. Those should probably be refactored to use the XML syntax if possible.