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Summary
SUMMARY: None
Purpose of change
add a guidelines section to json inheritance doc advising contributors not to over use copy-from
Describe alternatives you've considered
Let @kevingranade write up guidelines for data inheritance. I am attempting to save him the trouble or at least put up a draft until he gets the opportunity.
Additional context
I got these guidelines via #40274 (ie., Don't do what I did and create a complicated cascade of inheritance 7 levels deep.)