Request: Verb: Toggle descending/following all symlinks

In some directories I use symlinks to other directories, and I would like to be able to filter down the tree, including children of symlinks.

I understand it's probably a bad idea to turn that behavior on by default, but I'd like to interactively toggle it, when I'm in a situation where it seems reasonable.

The issue names no files, tests, or entry points. Start by locating the directory traversal and interactive command handling, then determine where symlink descent is filtered. Done means an interactive toggle can include or exclude children reached through directory symlinks without changing the default behavior.

Written by the indexing model from the issue text.