8 classes are annotated with ViewsArgumentDefault in Zircon Profile 8

ArgumentDefaultTest in core/modules/views/tests/modules/views_test_data/src/Plugin/views/argument_default/ArgumentDefaultTest.php

Defines a argument default test plugin.

CurrentUser in core/modules/user/src/Plugin/views/argument_default/CurrentUser.php

Default argument plugin to extract the current user

Fixed in core/modules/views/src/Plugin/views/argument_default/Fixed.php

The fixed argument default handler.

Node in core/modules/node/src/Plugin/views/argument_default/Node.php

Default argument plugin to extract a node.

QueryParameter in core/modules/views/src/Plugin/views/argument_default/QueryParameter.php

A query parameter argument default handler.

Raw in core/modules/views/src/Plugin/views/argument_default/Raw.php

Default argument plugin to use the raw value from the URL.

Tid in core/modules/taxonomy/src/Plugin/views/argument_default/Tid.php

Taxonomy tid default argument.

User in core/modules/user/src/Plugin/views/argument_default/User.php

Default argument plugin to extract a user from request.