*** Version 0.2.0 - 2018-09-07

Functional (static/func.js):
- More isolation with private fields;
- Remove filtered items from array and return them in new array: `$.remove()`.

Events (emmiter.js):
- Multiple event handling stages (handler rank is identified by a numerical value);
- Event handler results are merged into one object and event is
  treated as handled on current stage if this object is not empty;
- Any-handlers -- if not handled by some target handler, emit to any-handler.

MQ Discovery (mq/discovery.js):
- Ensure that list of instances will contain own instance ASAP.

Web (web/index.js):
- Ability to manually confirm on web server readiness for binding.

Main module (index.js; static/main.js):
- Immediately terminate application after graceful shutdown time elapsed;
- Immediately terminate application on double user-terminating signals (f.x. Ctrl+C).

*** Version 0.3.2 - 2018-11-01

MQ Mongo-based (mq/mongo/):
- Support queue priority (records with lower priorities are processed first);
- Support queue topic (only one from several records that have the same topic are guaranteed to be processed at a moment).
- Support important queue records (in case of clean exit, finalizer will wait within graceful shutdown period for such tasks to finish).
- Reduced default visibility timeout (from 3 minutes to 1 minute).
- Periodically wake up workers (in visibility timeout period) to check for records which had been possibly stalled after crash.

MQ Discovery (mq/discovery.js):
- Retry after unsuccessful attempt to signal instance up event for keep-alive (caused by connection loss etc.).

*** Version 0.3.3 - 2019-01-31

Main module / error logging (index.js):
- Static dollar support (circular): `ClasyncClass.$ = ClasyncClass`.

Main module / error logging (index.js; static/error.js):
- Logging wrappers: `$.log`, `$.logError`, `$.logFatal`, `$.logDebug`.

*** Version 0.3.8 - 2019-04-05

Cache (cache.js):
- Support unlimited values for maxCount and maxLifetime. 

MQ Mongo-based (mq/mongo/):
- Delay before retrying sync on too big network latency detected;
- Fix topic race condition detection bug;
- Apply deprecations of `mongoose`.

Functional (static/func.js):
- Support multiple key grouping of `groupBy` if grouping function/map returns array.

*** Version 0.3.10 - 2019-04-15

Main module (index.js; static/main.js):
- Add `afterInit()` and `beforeFinal()`;
- Add `initFatal()`;
- Add `mainFatal()`.

Main module / error logging (index.js; static/error.js):
- Minor bugfixes.

Functional (static/func.js):
- Add `$.firstKey()`, `$.firstValue()`, `$.firstEntry()`;
- Add `$.regExpInput()`.

*** Version 0.3.11 - 2019-05-24

Functional (static/func.js):
- Make `$.makeObject()` use null-prototype object as a base.

MQ Dispatcher (mq/disp.js):
- Register inline workers in `$.afterInit()`.

MQ Mongo-based (mq/mongo/):
- Do not try to signal queue if queue item is lost;
- Set default remote to local time sync retries to 3.

Web (web/rest.js):
- Register inline routes in `afterInit()`. 

*** Version 0.4.0 - 2019-06-19

Overall:
- Prefer `$.makeObject()` for creating dictionaries.

MQ Dispatcher (mq/disp.js):
- Support multiple handlers of the same inline worker as `N*TYPE name`, f.x. `4*WORKER processUsers`.

*** Version 0.5.1 - 2019-08-07

Overall:
- Add all classes to tree under base class, f.x. `require('clasync').Web` is same as `require('clasync/web')`.

Functional (static/func.js):
- Add mappings: `$.null`, `$.bound`;
- Add reducing: `$.min`, `$.max`.

Workers and Threads (worker/*; thread/*):
- Add own classes for `'cluster'` (`$.Worker`) and `'worker_threads'` (`$.Thread`).

*** Version 0.6.3 - 2019-08-17

MQ Mongo-based (mq/mongo/):
- Add `queue:sleep` pubsub event when queue runs out of active tasks;
- Add `at`, `in` options for `.push()`;
- Add `expires`, `ttl` options for `.push()`;
- Add `.push()` options support to `.rpc()`;
- Remove `queueEventName`. Add `queuePfx`, `newTaskEvent`, `sleepEvent`;
- Per-instance `visibilityMsec` value;
- Verbose `queue:newTask` pubsub events.

MQ Dispatcher (mq/disp.js):
- Add options support to `.push()` and `.rpc()` wrappers.

Main module (index.js; static/main.js):
- Add `$.App`;
- Add flexible `configure`;
- Fatal error if main module class is `Clasync` itself;
- Fix bug with `.exit()`.

Main module / error logging (index.js; static/error.js):
- Add support for DEBUG env var: `$.getDebug`, `$.logDebug`.

Functional (static/func.js):
- `$.all()` and `$.race()` now accept promises in multiple arguments (gets flattened).

*** Version 0.6.4 - 2019-08-21

MQ Mongo-based (mq/mongo/):
- Add options to `.worker()` and `.rpcworker()`.

MQ Dispatcher (mq/disp.js):
- Add `!` prefix for worker's `important` override option.

Functional (static/func.js):
- `$.all()` and `$.race()` no more accept flattened, only arrays (revert v.0.6.3).

*** Version 0.7.5 - 2019-10-04

Main module (index.js; static/main.js):
- Get rid of instance substitution in constructor by Promise. Introduce `this.$.ready` symbol.

MQ Mongo-based (mq/mongo/):
- Add alternative pubsub redis support.

*** Version 0.7.6 - 2019-11-08

Main module (index.js):
- Bugfix: `.beforeFinal()` runs before deps finalization and allows to change finaling reason;
- Class `App` is now extended from `Clasync.Emitter`.

Functional (static/func.js):
- Add `.interface()` method, allowing to add fields and methods from another class.

Workers and Threads (worker/*; thread/*):
- Add feedback `.rpc()` from worker to pool;
- Added class types;
- Default empty object `$.configure`.

MQ Mongo-based (mq/mongo/):
- Various bugfixes;
- Disable idle queue `.syncTime()`;
- Disable delayed messages support;
- Add ability to disable `topic` support to `.worker()`: `noTopic` boolean.

MQ Dispatcher (mq/disp.js):
- Add option flag `?` for `noTopic`.

Web (web/index.js; web/api.js):
- Moved automatic `.ready()` to `.afterInit()`;
- Customizable Web API headers and options: `allowedHeaders`, `exposedHeaders`, `origin`, `compression`, `trustProxy`.

*** Version 0.8.2 - 2019-11-29

Overall (db/; mq/; pay/; web/):
- Extend classes from `Clasync.Emitter` rather than from `Clasync`.

Crypt (crypt.js):
- Update to use IV-based cipher creation;
- Support custom boolean flags in token.

MQ Discovery (mq/discovery.js):
- Prefix redefine in constructor;
- Poll instances in `.afterInit()` to increase stability;
- Add events: 'beforeUp', 'up', 'down';

Functional (static/func.js):
- Add '$.objSort()`, `$make()` synonym of `$.makeObject()`, `$.accumulate()`;
- Date support in `$.clone()` and `$.cloneDeep()`;
- Support multiple groups for `$.inverts()` and `$.groupBy()`;

Promise utilities (static/promise.js):
- Support rest parameters in `$.promisify()`;
- Add `$.bind()`, `$.bindJob()`, `$.timeThrottle()`;

Web (web/index.js; web/api.js; web/rest.js):
- Move `.express()` to `Web`, alias it from `Web.Rest`;
- Add `.json()`, `.form()`, `.file()`, `.files()` middleware to `Web`;
- Append line break to `Web.Api` JSON response;
- `Web.Api`: make `.customError` code 500 by default;
- Return JSON error representation from `Web.Api` for `limitExceeded`;
- `Web.Rest`: add argument support as `req.mwArg` for middleware declaration in REST method;
- Support middleware from current `Web.Rest` instance, prepended with `.` in declaration;
- Deprecate `Web.Upload`.

*** Version 0.8.4 - 2019-11-30

Main module (index.js):
- Flexible `deps` in `.init()`.

Promise utilities (static/promise.js):
- Return result from `$.timeThrottle()` promise;
- Add `$.bindOnce`.

*** Version 0.8.5 - 2020-01-13

MQ Mongo-based (mq/mongo/):
- `.push()`: add `maxTries` and `failQueue` options; `triesLeft` field in DB;
- Add `queue:discard` pubsub event;
- Change order of per-queue pubsub events: `QUEUE_NAME:queue:EVENT`;
- Deprecate global `maxRequeuesOnError`, add global `maxTries` default.

*** Version 0.8.6 - 2020-02-13

Cache (cache.js):
- Events (expire, replace, remove, add).

*** Version 0.8.9 - 2020-03-11

DB Mongo (db/mongo/):
- Add `crashOnDisonnect` boolean property;
- Add `.on('disconnect')` event.

MQ Mongo-based (mq/mongo/):
- Add `failReason`, `requeueOnErrorMsec`;
- Default `failQueue` to 'unhandledExceptions';
- Default `maxTries` to 3;
- Default `requeueOnErrorMsec` to 21000;
- Fix `syncTime` flood bug;
- Worker `topic` option instead of `noTopic`. `?` modifier specifies that topic is used.

Promise utilities (static/promise.js):
- Add `$.callOnce()`.

*** Version 0.9.1 - 2020-04-09

Functional (static/func.js):
- Add: `$.int32()`, `$.int()`, `$.string()`, `$.funcSort()` moved out from `$.objSort()`, `$.objFuncSort()`;
- Add: `$.ensure()`, `$.setDef()`, `$.setPush()`, `$.setUnshift()`, `$.setExtend()`, `$.setDefaults()`;
- `$.accumulator` is suitable for `[].reduce()`.

Promise utilities (static/promise.js):
- Add `$.IoC()`.

*** Version 0.9.9 - 2020-06-10

Functional (static/func.js):
- Add `$.append()`;
- Ensured safe big array appending and big object assigning;
- Add `$.jsonString()`, `$.jsonParse()`;
- Add `Set` and `Map` support to `$.string`, `$.jsonString`, `$.clone`, `$.cloneDeep`, `$.setAdd`, `$.accumulate`;
- Add `$.merge`, `$.mergeDeep`, `$.unmerge`, `$.unmergeDeep`;
- Add `$.prod()`, `$.safeProd()`;
- Add `$.numKeys()`;
- Add `$.anyInstanceOf()`, `$.iterableTypes`.

Promise utilities (static/promise.js):
- Add `$.timeThrottleCached`;
- Add support of immediate (0) time to `$.timeThrottle`.

Main module (index.js):
- Add self autobound functions (declared with suffix '$').

*** Version 0.9.10 - 2020-06-15

Functional (static/func.js):
- Optimizations for big data with iterators and streams;
- Add `$.echoAsync`, `$.nullAsync`, `$.boundAsync`;
- Add `$.keys()`, `$.values()`, `$.entries()`, `$.keysValues()`;
- Add `$.flattenIter()`, `$.flattenAsync()`, `$.flattenDeepIter()`, `$.flattenDeepAsync()`;
- Add `$.makeAsync()`, `$.extendAsync()`, `$.defaultsAsync()`;
- Add `$.chunkIter()`, `$.chunkAsync()`;
- Add `$.partialIter()`, `$.partialAsync()`, `$.chunkIterIter()`, `$.chunkAsyncAsync()`;
- Add `$.mapIter()`, `$.mapAsync()`, `$.mapMultiIter()`, `$.mapMultiAsync()`;
- Add `$.filterIter()`, `$.filterAsync()`;
- Add `$.array()`, `$.arrayAsync()`;
- Add `$.sliceIter()`, `$.sliceAsync()`;
- Add `$.last()`, `$.lastAsync`, `$.cutLastIter()`, `$.cutLastAsync()`;
- Add `$.sliceRightIter()`, `$.sliceRightAsync()`;
- Add `$.forkIter()`, `$.forkAsync()`;
- Add `$.iterator()`, `$.iteratorAsync()`, `$.iteratorObj()`, `$.iteratorObjAsync()`;
- Add `$.array()`, `$.arrayAsync()`;
- Add `$.zipIter()`, `$.zipAsync()`, `$.collateIter()`, `$.collateAsync()`;
- Add `$.feedAsync()`;
- Add `$.nsecAsync()`;
- Add `$.execIter()`, `$.execAsync()`.

*** Version 0.9.13 - 2020-10-06

Main module (index.js):
- Static hub binding: `this.$dep.$ === this.$.$dep`.

MQ Mongo-based (mq/mongo/):
- Add index by `queue, topic`.

*** Version 0.9.14 - 2020-10-24

Packages (package.json)
- Update all to latest versions.

Functional (static/func.js):
- Add `limit` arg to `$.forkIter()` and `$.forkAsync()`.

*** Version 0.9.15 - 2020-11-12

Dependencies (package.json):
- Update module versions, except socket.io.

Functional (static/func.js):
- Add `$.stretch()`, `$.stretchIter()`, `$.stretchAsync()`;
- Add nullable result support to mapping function of `$.mapMultiIter()` and `$.mapMultiAsync()`;
- Add `$.repeatIter()`, `$.repeatAsync()`.

*** Version 0.9.16 - 2020-11-24

Functional (static/func.js):
- Change `$.nsecAsync` to return `{item, index, time}`, add `$.nsecMcSec`, `$.nsecMsec`, `$.nsecSec`, `$.nsecMin`;
- Add `$.feedback()` wrapper to send back `yield` return values;
- Add `$.pageAsync()` for paging of iterable.

Main module (index.js; static/main.js):
- Pass `process.argv` to `.main(argv)`.

*** Version 0.10.0 - 2020-11-27

Functional (static/func.js):
- Deprecate `$.array()` for `$.arrayIter()`;
- Change `$.flattenIter()`, `$.flattenAsync()` to skip nullable arguments;
- Add `$.sepIter()`, `$.sepAsync()`;
- Add `$.stringIter()`, `$.stringAsync()`;
- Change `$.mapKeys` value projection from object.

*** Version 0.10.1 - 2020-12-22

Overall:
- Improve `...$()` self-bind isolation and class inheritance.

Main module (index.js; static/main.js):
- Improve main module lifecycle;
- Add `$.mainFinal()`.

Functional (static/func.js):
- Add `$.fromEntries()` aliased by `$.fromPairs()`;
- Add `$.stopIter()`, `$.stopAsync()`.

*** Version 0.10.6 - 2021-03-11

DB Mongo (db/mongo/):
- Model grabs schema in `.afterInit()`.
- Static `Schema`, `Mixed`, `ObjectId`.

Main module (index.js; static/main.js):
- Support to explicitly define `$.mainModule`;
- Log main shutdown event;
- Add `.suppressCrash` option to main instance.

Functional (static/func.js):
- Add `$.not()`, `$.notAsync()`;
- Add `$.chunkByIter()`, `$.chunkByAsync()`, `$.chunkByTimeAsync()`;
- Refactor to `$.asyncIterator()`, `$.asyncIteratorObj()`;
- Add `$.generator()`, `$.asyncGenerator()`, `$.iterable()`, `$.asyncIterable()`;
- Add `$.prefetchAsync()`;
- Add `$.rangeIter()`, `$.reduceIter()`, `$.reduceAsync()`;
- Add `$.dimIter()`, `$.dimAsync()`;
- Add `$.pure()`, `$.pureAsync()`, `$.proto()`, `$.protoAsync()`;

Web (web/index.js; web/api.js; web/rest.js):
- Add default error 'apiNotFound' (404);
- Add support for iterative response;
- Add `.router` for endpoints;
- Add support for `.notFound()` method in Rest.

*** Version 0.10.8 - 2021-03-20

Main module (index.js; static/main.js):
- Reset `$.mainInstance` on main instance finalize;
- Add `$.mainClass`.

Functional (static/func.js):
- Add `$.walkInsort()', `$.insortEntries()`;
- Add `$.ensureEx()`.

*** Version 0.10.9 - 2021-04-27

Web API (web/api.js):
- Add CORS options `.corsOpts` and compression options `.compressOpts`.

Package (package.json):
- Fix dep versions. Disallow automatic updates.

*** Version 0.10.10 - 2021-05-21

Package (package.json):
- Upgraded versions to known latest stable, including `socket.io`.

MQ Discovery (mq/discovery.js):
- Improved stability;
- Add `.listIter()`;
- Made `.checkExpires()` and `.listInstances()` sync;
- Changed default `$.msecPingAlive` and `$.msecAliveExpires`.

MQ Mongo-based (mq/mongo/):
- Redis `.pub()` and `.sub()` are now async and awaiting acknowledge before return;
- Fix finalization bug.

Web (web/socket.js):
- Aligned to Socket.io version 4.

*** Version 0.11.1 - 2021-05-23

Async Classes (index.js):
- Assign config twice: 1 sync in constructor and 1 async before `.init()`.

Web Socket MQ Adapter (web/socket-mq.js):
- Update for `socket.io` v.4.

Web Socket (web/socket.js):
- Remove `.mq`, `.mqPrefix`;
- Add `.adapter: {mq, opts: {prefix}}`;
- Fix multiple socket finalization by a hack `io.httpServer = null`.

Functional (static/func.js):
- Add `$.xorIter()`, `$.xorAsync()`.

*** Version 0.11.3 - 2021-05-28

Event Emitter (emitter.js):
- Allow firing original events from object extensions.

Overall (mq/; web/):
- Default `Emitter` event handlers;
- Allow loadtime action handler methods in subclasses.

Functional (static/func.js):
- Add `.scanObject()`, `.scanObjectAll()`.

*** Version 0.11.6 - 2021-06-07

MQ Discovery (mq/discovery.js):
- Reduce defaults for crashed instances: `$.msecPingAlive`, `$.msecAliveExpires`;
- Correctly report crashed instances in `.onDown()`;
- Forcefully exit from lagged instances.

MQ Mongo-based (mq/mongo/):
- Fix concurrency on first DB initialization;
- Improve stability on finalization;
- Add Redis error handler.

Overall:
- Fix `...$()` self-bind isolation and class inheritance.

*** Version 0.11.11 - 2022-11-07

Overall:
- Update `dependencies` versions in `package.json`.

*** Version 0.11.12 - 2023-07-13

Web (web/index.js):
- Add `onAppCreated()` virtual method.