gh-135573: Make pickled lists, sets and dicts a tiny bit smaller#144162
Merged
serhiy-storchaka merged 1 commit intopython:mainfrom Feb 18, 2026
Merged
gh-135573: Make pickled lists, sets and dicts a tiny bit smaller#144162serhiy-storchaka merged 1 commit intopython:mainfrom
serhiy-storchaka merged 1 commit intopython:mainfrom
Conversation
Ensure that APPENDS and SETITEMS are never used for a batch of size 1. Ensure that ADDITEMS and SETITEMS are never used for a batch of size 0. This harmonizes the C implementation with the Python implementation which already guarantees this and makes a pickle a tiny bit smaller with a tiny chance (about 0.1%). Saves 1 byte for list and dict with size 1001, 2001, ... Saves 2 bytes for set and dict with size 1000, 2000, ...
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Ensure that APPENDS and SETITEMS are never used for a batch of size 1.
Ensure that ADDITEMS and SETITEMS are never used for a batch of size 0.
This harmonizes the C implementation with the Python implementation which already guarantees this and makes a pickle a tiny bit smaller with a tiny chance (about 0.1%).
Saves 1 byte for list and dict with size 1001, 2001, ...
Saves 2 bytes for set and dict with size 1000, 2000, ...
APPENDSandADDITEMSmissing check #135573