Stability issue - pie install for php RC fails dep resolution

[asgrim]

Using a PHP RC, e.g. 8.5.0RC1, run pie install php/pdo --force

Expected behaviour: pdo should build

Actual behaviour:

🥧 PHP Installer for Extensions (PIE) 1.2.1@c14843f, from The PHP Foundation
You are running PHP 8.5.0RC1
Target PHP installation: 8.5.0RC1 nts, on Linux/OSX/etc x86_64 (from /usr/local/bin/php)
Note: You should probably use "docker-php-ext-install pdo" instead
Found package: php/pdo:8.5.0RC1 which provides ext-pdo
Your requirements could not be resolved to an installable set of packages.
Running update with --no-dev does not mean require-dev is ignored, it just means the packages will not be installed. If dev requirements are blocking the update you have to resolve those problems.
PIE Composer run failed with error code 2 (ERROR_DEPENDENCY_RESOLUTION_FAILED)

Workaround: pie install php/pdo:*@RC --force

Think the stability isn't cascading into Composer somewhere.