I'm creating a custom webform handler plugin based on the advice here, adding the class, in the correct directory, to an existing module.
I got the class name / some of the docblock info wrong initially - and need to change it. Having run
drush cr, the listing on /admin/structure/webform/config/handlers seems to be stuck on the old entry.
I get "Cannot declare class ... because the name is already in use" errors when trying to add the handler to the form, for a class name that I'm no longer using, and which, having cleared the cache, definitely isn't in
cache_discovery.webform_handler_plugins in the DB.
I've also swapped browsers.
What am I missing?