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-# Universally Unique Lexicographically Sortable Identifier
-
-![Project status](https://img.shields.io/badge/version-1.3.0-yellow.svg)
-[![Build Status](https://secure.travis-ci.org/oklog/ulid.png)](http://travis-ci.org/oklog/ulid)
-[![Go Report Card](https://goreportcard.com/badge/oklog/ulid?cache=0)](https://goreportcard.com/report/oklog/ulid)
-[![Coverage Status](https://coveralls.io/repos/github/oklog/ulid/badge.svg?branch=master&cache=0)](https://coveralls.io/github/oklog/ulid?branch=master)
-[![GoDoc](https://godoc.org/github.com/oklog/ulid?status.svg)](https://godoc.org/github.com/oklog/ulid)
-[![Apache 2 licensed](https://img.shields.io/badge/license-Apache2-blue.svg)](https://raw.githubusercontent.com/oklog/ulid/master/LICENSE)
-
-A Go port of [alizain/ulid](https://github.com/alizain/ulid) with binary format implemented.
-
-## Background
-
-A GUID/UUID can be suboptimal for many use-cases because:
-
-- It isn't the most character efficient way of encoding 128 bits
-- UUID v1/v2 is impractical in many environments, as it requires access to a unique, stable MAC address
-- UUID v3/v5 requires a unique seed and produces randomly distributed IDs, which can cause fragmentation in many data structures
-- UUID v4 provides no other information than randomness which can cause fragmentation in many data structures
-
-A ULID however:
-
-- Is compatible with UUID/GUID's
-- 1.21e+24 unique ULIDs per millisecond (1,208,925,819,614,629,174,706,176 to be exact)
-- Lexicographically sortable
-- Canonically encoded as a 26 character string, as opposed to the 36 character UUID
-- Uses Crockford's base32 for better efficiency and readability (5 bits per character)
-- Case insensitive
-- No special characters (URL safe)
-- Monotonic sort order (correctly detects and handles the same millisecond)
-
-## Install
-
-```shell
-go get github.com/oklog/ulid
-```
-
-## Usage
-
-An ULID is constructed with a `time.Time` and an `io.Reader` entropy source.
-This design allows for greater flexibility in choosing your trade-offs.
-
-Please note that `rand.Rand` from the `math` package is *not* safe for concurrent use.
-Instantiate one per long living go-routine or use a `sync.Pool` if you want to avoid the potential contention of a locked `rand.Source` as its been frequently observed in the package level functions.
-
-
-```go
-func ExampleULID() {
-	t := time.Unix(1000000, 0)
-	entropy := ulid.Monotonic(rand.New(rand.NewSource(t.UnixNano())), 0)
-	fmt.Println(ulid.MustNew(ulid.Timestamp(t), entropy))
-	// Output: 0000XSNJG0MQJHBF4QX1EFD6Y3
-}
-
-```
-
-## Specification
-
-Below is the current specification of ULID as implemented in this repository.
-
-### Components
-
-**Timestamp**
-- 48 bits
-- UNIX-time in milliseconds
-- Won't run out of space till the year 10895 AD
-
-**Entropy**
-- 80 bits
-- User defined entropy source.
-- Monotonicity within the same millisecond with [`ulid.Monotonic`](https://godoc.org/github.com/oklog/ulid#Monotonic)
-
-### Encoding
-
-[Crockford's Base32](http://www.crockford.com/wrmg/base32.html) is used as shown.
-This alphabet excludes the letters I, L, O, and U to avoid confusion and abuse.
-
-```
-0123456789ABCDEFGHJKMNPQRSTVWXYZ
-```
-
-### Binary Layout and Byte Order
-
-The components are encoded as 16 octets. Each component is encoded with the Most Significant Byte first (network byte order).
-
-```
-0                   1                   2                   3
- 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-|                      32_bit_uint_time_high                    |
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-|     16_bit_uint_time_low      |       16_bit_uint_random      |
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-|                       32_bit_uint_random                      |
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-|                       32_bit_uint_random                      |
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-```
-
-### String Representation
-
-```
- 01AN4Z07BY      79KA1307SR9X4MV3
-|----------|    |----------------|
- Timestamp           Entropy
-  10 chars           16 chars
-   48bits             80bits
-   base32             base32
-```
-
-## Test
-
-```shell
-go test ./...
-```
-
-## Benchmarks
-
-On a Intel Core i7 Ivy Bridge 2.7 GHz, MacOS 10.12.1 and Go 1.8.0beta1
-
-```
-BenchmarkNew/WithCryptoEntropy-8      2000000        771 ns/op      20.73 MB/s   16 B/op   1 allocs/op
-BenchmarkNew/WithEntropy-8            20000000      65.8 ns/op     243.01 MB/s   16 B/op   1 allocs/op
-BenchmarkNew/WithoutEntropy-8         50000000      30.0 ns/op     534.06 MB/s   16 B/op   1 allocs/op
-BenchmarkMustNew/WithCryptoEntropy-8  2000000        781 ns/op      20.48 MB/s   16 B/op   1 allocs/op
-BenchmarkMustNew/WithEntropy-8        20000000      70.0 ns/op     228.51 MB/s   16 B/op   1 allocs/op
-BenchmarkMustNew/WithoutEntropy-8     50000000      34.6 ns/op     462.98 MB/s   16 B/op   1 allocs/op
-BenchmarkParse-8                      50000000      30.0 ns/op     866.16 MB/s    0 B/op   0 allocs/op
-BenchmarkMustParse-8                  50000000      35.2 ns/op     738.94 MB/s    0 B/op   0 allocs/op
-BenchmarkString-8                     20000000      64.9 ns/op     246.40 MB/s   32 B/op   1 allocs/op
-BenchmarkMarshal/Text-8               20000000      55.8 ns/op     286.84 MB/s   32 B/op   1 allocs/op
-BenchmarkMarshal/TextTo-8             100000000     22.4 ns/op     714.91 MB/s    0 B/op   0 allocs/op
-BenchmarkMarshal/Binary-8             300000000     4.02 ns/op    3981.77 MB/s    0 B/op   0 allocs/op
-BenchmarkMarshal/BinaryTo-8           2000000000    1.18 ns/op   13551.75 MB/s    0 B/op   0 allocs/op
-BenchmarkUnmarshal/Text-8             100000000     20.5 ns/op    1265.27 MB/s    0 B/op   0 allocs/op
-BenchmarkUnmarshal/Binary-8           300000000     4.94 ns/op    3240.01 MB/s    0 B/op   0 allocs/op
-BenchmarkNow-8                        100000000     15.1 ns/op     528.09 MB/s    0 B/op   0 allocs/op
-BenchmarkTimestamp-8                  2000000000    0.29 ns/op   27271.59 MB/s    0 B/op   0 allocs/op
-BenchmarkTime-8                       2000000000    0.58 ns/op   13717.80 MB/s    0 B/op   0 allocs/op
-BenchmarkSetTime-8                    2000000000    0.89 ns/op    9023.95 MB/s    0 B/op   0 allocs/op
-BenchmarkEntropy-8                    200000000     7.62 ns/op    1311.66 MB/s    0 B/op   0 allocs/op
-BenchmarkSetEntropy-8                 2000000000    0.88 ns/op   11376.54 MB/s    0 B/op   0 allocs/op
-BenchmarkCompare-8                    200000000     7.34 ns/op    4359.23 MB/s    0 B/op   0 allocs/op
-```
-
-## Prior Art
-
-- [alizain/ulid](https://github.com/alizain/ulid)
-- [RobThree/NUlid](https://github.com/RobThree/NUlid)
-- [imdario/go-ulid](https://github.com/imdario/go-ulid)