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reading from the primary guarantees that read operations reflect the latest version of a document

cases of 2 members transiently thinking they're both primaries – partial network partition; if primary not responsive, will trigger an election, and primary starts responding when election on new primary finishes

old primary has a write that will be rolled back, but people still reading from old primary

FAQ – consistency – already part of DOCS-5141

Where appropriate, note the visibility of data (by other clients prior to returning from write as well as visibility of data that will be rolledback)