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The algorithm for the compiler to crunch through reborrowed vs copied fields is not too bad, but it's still a bit involved and if it were to be reproduced at each reborrowing coercion site then the performance penalty would probably be significant
from the top result below
https://internals.rust-lang.org/t/pre-rfc-reborrow-trait/22972
Reborrowing happens implicitly at each coercion-site