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Milian Wolff authored
Basically replace the single ::op call with two variants: 1. read, taking a `const& repo` 2. write, taking a `& repo` This clarifies the intention and makes the code more resilient. While doing this change, I reviewed the usages and fix a few cases where we took a mutable repo but only want/need a const ref. Thanks to Igor Kushnir for the suggestion!
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