Malformed UUIDs v4

[bennycode]

I have been using new UUID(4).format() and noticed that it generates some invalid / malformed UUIDs.

A proper UUID v4 looks like this:

• b277311c-dd9c-45c1-a041-2f78c5fd066e (32 chars total, 4 dashes)

But I somehow received the following UUIDs:

• 298f8a6b-3e-1c4-4bba-9488-8f4b233e63e7 (34 chars total, 5 dashes)
• 15ee-168da--20c6-4c1f0-9a2b--2806bf323e706 (36 chars total, 6 dashes)

Is it possible that UUID(4).format() generates UUIDs with too many dashes (with 1 extra char per extra dash)? Can this library be affected by a sign problem?

[rse]

I cannot reproduce your problem:

$ cat test.js 
const UUID = require("./")
for (let i = 0; i < 100000; i++)
     console.log(new UUID(4).format())
$ node test.js | egrep -v '^.{36}$' 

Even with 100K generated UUIDs it was always 36 characters in total...

[Yserz]

We replaced the library without other changes and the issue went away.

[bennycode]

@rse we experienced the described problem only with some users but reliably. Is it possible that your algorithm uses system specific values for its computation?

[LeeGDavis]

We're encountering this issue as well. Although it occurs very rarely, it still causes disruptions for us. We cannot reliably reproduce this.
A couple examples if it is at all helpful:

• 2facd3a8-258a-4fbc-ae34-5c743584-115c
• 9e2dfa1d-0e4f-4c40-9893-d55ad66151-154