v5.2.0 has a breaking repl bug (#4257). It was fixed in #4215 with a two-line change.

Could this be merged into the 5.2.x line and released as v5.2.1, so that the 5.2.x line no longer has breaking changes that would make it deserve to be a 6.x release? Hopefully git cherry-pick 1999fdc859ec80740f64e3af1dea54acbc4d4f37 plus the release process is not a burdensome amount of work for anybody.