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Previously these functions returned the previous segment number if the LSN was on a segment boundary. We now always return the current segment number for an LSN. Docs updated to reflect this change. Regression tests added, author Andres Freund. Also mentioned in thread https://postgr.es/m/flat/20220204225057.GA1535307%40nathanxps13#d964275c9540d8395e138efc0a75f7e8 BACKWARD INCOMPATIBILITY Reported-by: Kyotaro Horiguchi Discussion: https://postgr.es/m/20190726.172120.101752680.horikyota.ntt@gmail.com Co-authored-by: Kyotaro Horiguchi Backpatch-through: master