Issue #19735 has been updated by nevans (Nicholas Evans). Description updated I hadn't realized that `"random/formatter"` belonged to `securerandom`. I closed the `ruby` PR and created a new PR here: https://github.com/ruby/securerandom/pull/19. There was also another earlier PR which looks almost identical to my original PR: https://github.com/ruby/securerandom/pull/15. I updated my PR to provide an alternative tradeoff: allow up to 12 bits of extra timestamp precision, at the cost of code complexity and a small performance penalty. I personally would be satisfied with either PR. ---------------------------------------- Feature #19735: Add support for UUID version 7 https://bugs.ruby-lang.org/issues/19735#change-103739 * Author: nevans (Nicholas Evans) * Status: Open * Priority: Normal ---------------------------------------- Although the specification for UUIDv7 is still in draft, the UUIDv7 algorithm has been stable as the RFC progresses to completion. Version 7 UUIDs can be very useful, because they are lexographically sortable, which can improve e.g: database index locality. See section 6.10 of the draft specification for further explanation: https://datatracker.ietf.org/doc/draft-ietf-uuidrev-rfc4122bis/ ```ruby require 'random/formatter' Random.uuid_v7 # => "0188ca50-fcc0-7881-b5c5-6d55cd8fc373" Random.uuid_v7 # => "0188ca51-0069-7304-be2e-0c3cd908789b" Random.uuid_v7 # => "0188ca51-04aa-7b57-a6ec-c49573412a9d" Random.uuid_v7 # => "0188ca51-0853-7979-ae37-485460e9f4f1" # or prng = Random.new prng.uuid_v7 # => "0188ca51-5e72-7950-a11d-def7ff977c98" ``` PR here: https://github.com/ruby/securerandom/pull/19 -- https://bugs.ruby-lang.org/