Extended K-Sortable UID

This is a browser-friendly implementation of ksuid in JavaScript.
The implementation is extended to produce UIDs in descending order, which is beneficial in certain cases,
e.g. when used as a key for KV Cloudflare worker storage entries that should be listed in descending order.

Binary keys generated in ascending order per reference KSUID implementation are 20 bytes long,
whereas extended KSUIDs are 21 bytes long and are always starting with 61, indicating that timestamp value
is calculated as a difference between the maximum possible value (max 32bit unsigned integer) and seconds since 14e8:

``sh


KSUID - Ascending order

4 bytes 16 bytes
[ ][ ][ ][ ] [ ][ ][ ]...[ ][ ][ ]
sec since 14e8 random bytes

xKSUID - Descending order

1 byte 4 bytes 16 bytes
[ 61 ] [ ][ ][ ][ ] [ ][ ][ ]...[ ][ ][ ]
'z' sec till MAX random bytes
`

Text representation for KSUID is 27 characters long, and 28 characters long with xKSUID, starting with z:

`sh


KSUID

24bxFgAT8RPOk01OWecxD8bcLKo

#xKSUID
zYS4GmVK9Hn2JHPota8SAOBQsPgR
`

Usage

API:

`js
generate() // ASC KSUID
generate(true) // DESC xKSUID
generate(true,new Date('2022-01-01').getTime()) // DESC xKSUID with custom timestamp
`

Via CDN:

`html

`

Via NPM:

`sh
npm install xksuid
`

For browser:

`js
import {generate} from 'xksuid'
`

For NodeJS ESM:

`js
import {generate} from 'xksuid'
`

For NodeJS CommonJS:

`js
const {generate} = await import('xksuid')
`

Benchmark

`sh
> xksuid@0.0.1 benchmark
> node benchmark.js

8 x Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHz

Running 100000 ops

3535.918315887451 ms 35.359183158874515 ns/op 28281.196302155477 ops/sec
``