For recent versions of the compiler, there are generally some examples and explanations for the highlighted features in the release announce, that you can find at OCaml Changelog (for instance Release of OCaml 5.4.0 • OCaml Changelog). For 5.2.0, the discuss announce is a bit more detailed OCaml 5.2.0 released . For older versions, if you read French or trust automated translation, I am still fond of the release articles at linuxfr.org . Also the full changelog is more detailed that the feature highlight.
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