Replicates mongomock#692 — closes #191 (immutable projection)
Replicates mongomock#795 — closes #184 ($in comparison)
Replicates mongomock#819 — closes #178 ($slice parsing)
Replicates mongomock#847 — closes #170 ($addToSet $each)
Replicates mongomock#860 — closes #169 ($redact support)
Replicates mongomock#895 — closes #158 (collation signature)
Replicates mongomock#919 — closes #154 ($in array matching)
Replicates mongomock#933 — closes #147 (BulkOpBuilder sort)
Replicates mongomock#936 — closes #145 (NaN handling)
Replicates mongomock#944 — closes #144 (utcnow deprecation)

Version bump: 7.4.0 -> 7.4.1

## [7.4.1] - 2026-05-21
### Changed
- Drop Python 3.14 from test matrix and classifiers — not yet stable, incompatible with runtime dependencies
- Add pymongo 4.12.0 and 4.14.0 to hatch-test matrix for broader compatibility coverage

### Fixed
- TTL document expiry no longer crashes on Python 3.13 — normalize naive datetimes to UTC-aware before subtraction in `_value_meets_expiry` (store.py)
- Replace deprecated `datetime.utcfromtimestamp` with `datetime.fromtimestamp(..., tz=timezone.utc)` in aggregation `$convert` to date handlers (aggregate.py)
- Replace deprecated `datetime.utcnow()` with `datetime.now(timezone.utc).replace(tzinfo=None)` in helpers and test suite
- Fix hatch-test matrix so environment `hatch-test.*-4.11.0` correctly installs `pymongo==4.11.0` (missing `if` clause)
- `find()` projection no longer mutates original document data (mongomock#692 — closes #191)
- `$in` operator correctly handles empty-list values (mongomock#795 — closes #184)
- `$slice` aggregation operator evaluates arguments as expressions (mongomock#819 — closes #178)
- `$addToSet` with `$each` correctly deduplicates repeated values across runs (mongomock#847 — closes #170)
- `$redact` aggregation stage now supported (mongomock#860 — closes #169)
- `Cursor.collation` matches PyMongo 4.x method signature (mongomock#895 — closes #158)
- `$in` operator matches whole arrays in document values (mongomock#919 — closes #154)
- `BulkOperationBuilder.add_update` and `_update` support `sort` parameter (mongomock#933 — closes #147)
- NaN comparison handling in filter `$eq` operator (mongomock#936 — closes #145)
- Replace deprecated `datetime.utcnow` with `datetime.now(UTC)` on Python 3.11+ (mongomock#944 — closes #144)