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2bd440e07c
Add a remote config `global.maxIncrementalMacsPerEnvelope` (client fallback of 10) that limits how many attachment pointers in a single envelope can have their incrementalMac field populated. Each incrementalMac can be up to 8 KiB, so having too many risks exceeding the 96 KiB envelope size threshold. Excess attachment pointers have their incrementalMac and chunkSize fields stripped.