2.0.0-RC1 - released 2020-09-10

Changelog

Added more advanced filtering to avoid loading all versions of all referenced packages when resolving dependencies, which should reduce memory usage further in some cases
Added support for many new lib-* packages in the platform repository and improved version detection for some ext-* and lib-* packages
Added an --ask flag to create-project command to make Composer prompt for the install dir name, useful for project install instructions
Added support for tar in artifact repositories
Added a cache-read-only config option to make the cache usable in read only mode for containers and such
Added better error reporting for a few more specific cases
Added a new optional available-package-patterns attribute for v2-format Composer repositories, see UPGRADE for details
Fixed more PHP 8 compatibility issues
Lots of minor bug fixes for regressions