BinData stored/changed incorrectly

[daniel-sc]

When I create or update a document that contains the following attribute:

{ __pclass: BinData(80, 'Q2JmcFxhcGlcYmF0Y2gyXGpvYnNcYmFja3VwXEJhY2t1cFJvb3RKb2I=') }

afterwards this attribute looks as follows:

{ __pclass: BinData(50, 'Q2JmcFxhcGlcYmF0Y2gyXGpvYnNcYmFja3VwXEJhY2t1cFJvb3RKb2I=') }

(note the change of 80 to 50!)

This can be reproduced with the docker image version 1.0.0-alpha.4 with mongo 6.0.6.

Jira issue: https://jira.mongodb.org/browse/TOOLS-3466