• Add an easy way to compare exception types between mongomock and pymongo
• collection.py: Fix return value of Collection.documents_count() (#586)
• Type conversion (#583)
• Add the new kwarg bypass_document_validation
• Add support for subtracting milliseconds from a date (#581)
• Implement the $addFields (alias $set) stage of aggregate. (#574)
• Do not modify inserted documents, except for the _id
• Test mongomock on Python 3.8 as well
• Add raw batch BSON operations as not implemented (missing) features
• Add new aggregation pipeline stages introduced in 4.2 and mark them as not implemented
• Silent some new pyint warnings
• Raise a NotImplementedError for valid query operators that have not been implemented in Mongomock yet
• Raise an error when an aggregate expression contains more than one field. (#557)
• Fix $ne on arrays
• Fix lint error detected by a new version of pylint