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I haven't tested this extensively, but this diff got core 0.15 compiling for both ocaml 5, and ocaml 4.x. I wasn't sure how to best handle the api changes for Ephemeron so I've re-exported the stdlib module for now. This is a breaking change compared to 0.15, but this module wasn't available in prior core releases from what I can tell, and I couldn't find references to it at-least in the open-source libraries published within the janestreet GitHub org.