Issues with latest Meteor versions & oplog converter

[arggh]

At least with Meteor versions 2.6.1 ... 2.8.1 the oplog converter will break with update operations formed/caused by Astronomy. Not exactly an issue of Astronomy, but I thought it might be worthwhile cross posting: meteor/meteor#12325

Errors such as

Error in oplog callback TypeError: Cannot read property 'a' of null
    at isArrayOperator (packages/mongo/oplog_v2_converter.js:46:19)
    at packages/mongo/oplog_v2_converter.js:91:11
    at Array.forEach (<anonymous>)
    at convertOplogDiff (packages/mongo/oplog_v2_converter.js:71:24)
    at packages/mongo/oplog_v2_converter.js:109:9
    at Array.forEach (<anonymous>)
    at convertOplogDiff (packages/mongo/oplog_v2_converter.js:71:24)
    at packages/mongo/oplog_v2_converter.js:109:9
    at Array.forEach (<anonymous>)
    at convertOplogDiff (packages/mongo/oplog_v2_converter.js:71:24)
    at oplogV2V1Converter (packages/mongo/oplog_v2_converter.js:122:3)
    at packages/mongo/oplog_observe_driver.js:607:16
    at Object.Meteor._noYieldsAllowed (packages/meteor.js:785:12)
    at OplogObserveDriver._handleOplogEntrySteadyOrFetching (packages/mongo/oplog_observe_driver.js:579:12)
    at packages/mongo/oplog_observe_driver.js:133:20
    at packages/mongo/oplog_observe_driver.js:17:9
    at Object.Meteor._noYieldsAllowed (packages/meteor.js:785:12)
    at packages/mongo/oplog_observe_driver.js:121:16
    at packages/mongo/oplog_tailing.js:108:7
    at runWithEnvironment (packages/meteor.js:1347:24)
    at Object.callback (packages/meteor.js:1360:14)
    at packages/ddp-server/crossbar.js:114:36

...might mean your Meteor app is failing to process the oplog entries caused by Astronomy's update operations and you clients will unknowingly operate based on stale data.