When did Jane Street take over development of OCaml? I knew they were heavy users, but I thought it was INRIA that were the main developers. This post implies that JS are running the show now...
Indeed, one of the great things about the OCaml compiler development process is that the core team is highly skeptical, and does a good job of rejecting marginal changes.
You'll find similar phrasing among major contributors to Postgres.
JS is probably confident in their ability to get their developments merged.