v0.4.0

• fixed incorrect bucket file deletion
• mongokit: fixed projection bug
• fix engine close deadlock with blocked transactions
• fixed stale bucket file deletion bug
• bsonkit: fix regex ordering
• mongokit: fixed error handling oversight
• dbkit: harden atomic file write
• further bucket hardening
• fixed oplog cleaning
• mongokit: support falsy/truthy values for $exists
• mongokit: fix projection inclusion
• support stream resumption with non-exact timestamp
• improved transaction checks
• dbkit: prevent timer leak
• added missing cursor lock
• provide context to delete
• close cursor before clearing it
• improved stream locking
• bsonkit: improved utf8 string length checking
• mongokit: fix $currentDate edge case
• mongokit: support boolean projection values
• bsonkit: fix integer compare range
• bsonkit: improved array access
• mongokit: improved $size matching
• use current TX also for db, coll and idx lists
• sort dbs and colls by name
• fix bucket cursor handling
• improved session transaction initialization
• validate oplog age window
• mongokit: fix smaller issues
• mongokit: fix $ne array matching
• mongokit: fix $type array matching
• mongokit: fix $exists array matching
• mongokit: support $pull operator
• mongokit: support $pullAll operator
• mongokit: support $addToSet operator
• mongokit: support $bit operator
• fix stream/engine closing
• mongokit: support $push modifiers
• mongokit: use doc constructor
• bsonkit: document mutation
• propagate database invalidation event to collection watchers
• bsonkit: fix non-finite number crashes
• bsonkit: prevent modulo by zero panics
• mongokit: detect $rename overlap
• mongokit: support $bit* query operators
• mongokit: support $slice [skip, limit] array form
• mongokit: add $elemMatch projection operator
• mongokit: support $mod query operator
• fix race in Session.startTransaction
• fix Bucket.Delete clobbering in-progress upload marker
• mongokit: support $type array operands
• fix gouroutine leak test
• validate bucket chunk size
• prevent crash on failed insert
• all: make sort retain insertion order
• bsonkit: handle unlikely timstamp counter overflow
• mongokit: fixed negative $size match
• mongokit: test no-op multi $or extraction
• bsonkit: support multi key indexes
• bsonkit: support nested multi key indexes
• updated README
• mongokit: make $rename atomic
• mongokit: hardened $addToSet operator
• mongokit: fixed $size operator array handling
• reject operator-style replacements
• only report actually changes documents as modified
• reject non-empty change stream pipelines
• bsonkit: look at array items when sorting
• allow Comment and Hint options
• mongokit: fixed extraction
• more bucket lifecycle hardening
• updated dependencies
• support dropping index by key
• implement remaining batch length
• ci: bumped dependencies