The 1.2.13 release was primarily a security and bug-fix update. Notable changes included:
: This extension indicates a "tarball" (a collection of files) that has been compressed using the XZ Utils (LZMA2) algorithm, which generally offers higher compression ratios than the traditional .gz format. Why This Version Matters zlib1213tarxz
: Install xz-utils .
According to the official zlib ChangeLog , the following features and fixes were implemented: zlib1213tarxz
The xz suffix in zlib1213tarxz is a deliberate choice by maintainers to reduce bandwidth and storage costs. Here’s a comparison using a typical zlib source tree: zlib1213tarxz