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The API for fill was changed in v0.17.0. The implementation for
fill
callsfill_exn
in v0.17.0 so there is no difference in implementation now https://github.com/janestreet/async_kernel/blob/v0.17.0/src/ivar0.ml#L303-L317 plus the older doc strings for v0.16 is the same as the new one onfill_exn
. It isn't clear whether there is just a bug fix or some behaviour change as there is no entry in CHANGES.md.