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While installing CiviCRM 5.31 on Drupal 8, composer had a problem during composer require civicrm/civicrm-{core,packages,drupal-8}:'~5.31'.

Console output

./composer.json has been updated
Running composer update civicrm/civicrm-core civicrm/civicrm-packages civicrm/civicrm-drupal-8
Loading composer repositories with package information
Updating dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - civicrm/civicrm-core[5.31.0, ..., 5.32.x-dev] require symfony/finder ~3.0 || ~4.4 -> found symfony/finder[v3.0.0-BETA1, ..., 3.4.x-dev, v4.4.0-BETA1, ..., 4.4.x-dev] but the package is fixed to v5.1.8 (lock file version) by a partial update and that version does not match. Make sure you list it as an argument for the update command.
    - Root composer.json requires civicrm/civicrm-core ~5.31 -> satisfiable by civicrm/civicrm-core[5.31.0, 5.31.x-dev, 5.32.x-dev].

Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.

I had previously installed drush/drush:10.3.6 which requires symfony/finder:5.1.8. However, civicrm/civicrm-core:~5.31 requires symfony/finder ~3.0 || ~4.4. This leads to the problem above. I had to use composer require drush/drush:10.3.5 to proceed with the installation.

Maybe civicrm-core should be updated to require symfony/finder:~5.1 as well?