design documents within the repo itself (under docs/RFCs [0]) actually do well to capture some of the past implementation details/rationale and future directions CockroachDB is planning to take. in my (very biased) opinion they've gone out of their way to keep everything as transparent as possible.
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[ 1.9 ms ] story [ 9.6 ms ] threadCould you imagine having this level of detail laid out during the development of postgres or mysql?
[0] - https://github.com/cockroachdb/cockroach/tree/master/docs/RF...