saveDocument() decodeTree reading count error

[jianminzhao]

FYI, a related issue:

Corrupt Revision Data error when saving documents

SDK: Couchbase Lite C Version: 3.0.2 OS: iOS & Android Error: kCBLErrorCorruptRevisionData This error has only been observed through error reports from user devices, and I have not been able to replicate it. It seems that saving a document can sometimes corrupt it, since after the first time this error has been returned when saving a document, subsequent attempts to save the document always fail with the same error. The document can still be purged, though. There are also crashes in CBLDat…