Error "Object support when dumping a YAML file has been disabled" on feature generation

Problem/Motivation

Calls to t() now return a TranslatableMarkup object rather than a string.

In FeaturesManager::initCorePackage() we generate a feature/package name and description through t(), which when exported to the .info.yml file is raising the error:

Drupal\Component\Serialization\Exception\InvalidDataTypeException: Object support when dumping a YAML file has been disabled. in Drupal\Component\Serialization\Yaml::encode() (line 29 of /var/www/drate/core/lib/Drupal/Component/Serialization/Yaml.php).

Proposed resolution

Cast name and description values to strings in FeaturesManager::initCorePackage().

Remaining tasks

User interface changes

API changes

Data model changes