Issue #16029 has been updated by sam.saffron (Sam Saffron).


@byroot

I think it heavily depends on usage... MySQL gem / PG would benefit from "lookup" followed by "create fstring if missing" cause vast majority of string it is creating when querying tables. 

My proposal is for the minimal building block we could use for getting fstrings unconditionally which would offer a fast path for fstring reuse. 

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Feature #16029: Expose fstring related APIs to C-extensions
https://bugs.ruby-lang.org/issues/16029#change-83575

* Author: byroot (Jean Boussier)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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As discussed with @tenderlove here: https://github.com/ruby/ruby/pull/2287#issuecomment-513865160

We'd like to update various data format parsers (JSON, MessagePack, etc) to add the possibility to deduplicate strings while parsing.

But unfortunately the `rb_fstring_*` family of functions isn't available to C-extensions, so the only available fallback is `rb_funcall(str, rb_intern("-@"))` which most parsers will likely consider too slow. So the various `rb_fstring_*` functions would need to be public.

Proposed patch: https://github.com/ruby/ruby/pull/2299



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