Issue #13077 has been updated by Benoit Daloze.


Eric Wong wrote:
>  Anyways, committed as r57698

This should have a NEWS entry and tests since it changes the semantics.

BTW, should my_string.freeze behave similarly to String#@-?
Otherwise String#freeze only dedup if the String is a literal.
Always deduping for String#freeze would make the semantics more consistent.

----------------------------------------
Feature #13077: [PATCH] introduce String#fstring method
https://bugs.ruby-lang.org/issues/13077#change-63172

* Author: Eric Wong
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
introduce String#fstring method

This exposes the rb_fstring internal function to return a
deduped and frozen string.  This is useful for writing all sorts
of record processing key values maybe stored, but certain keys
and values are often duplicated at a high frequency,
so memory savings can noticeable.

Use cases are many:

* email/NNTP header processing

  There are some standard header keys everybody uses
  (From/To/Cc/Date/Subject/Received/Message-ID/References/In-Reply-To),
  as well as common ones specific to a certain lists:
  (ruby-core has X-Redmine-* headers)
  It is also useful to dedupe values, as most inboxes have
  multiple messages from the same sender, or MUA.

* package management systems -
  things like RubyGems stores identical strings for licenses,
  dependency names, author names/emails, etc

* HTTP headers/trailers -
  standard headers (Host/Accept/Accept-Encoding/User-Agent/...)
  are common, but there are also uncommon ones.
  Values may be deduped, as well, as it is likely a user
  agent will make multiple/parallel requests to the same
  server.

* version control systems -
  this can be useful for deduplicating names of frequent
  committers (like "nobu" :)

  In linux.git and git.git, there are also common
  trailers such as Signed-Off-By/Acked-by/Reviewed-by/Fixes/...
  as well as less common ones.

* audio metadata -

  There are commonly used tags (Artist/Album/Title/Tracknumber),
  but Vorbis comments allows arbitrary key values to be stored.
  Music collections contain songs by the same artist or mutiple
  songs from the same album, so deduplicating values will be
  helpful there, too.

* JSON, YAML, XML, HTML processing

  certain fields, tags and attributes are commonly used
  across the same and multiple documents


---Files--------------------------------
0001-introduce-String-fstring-method.patch (3.47 KB)


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