I'd like to switch the default for the shell backend's

outputs_match_mode

field from

all_warn

to

all

which would make it an error to have unmatched globs in

output_files

/

output_directories

fields. Can I just document the switch for 2.26.x (and how users can migrate) or should there by a deprecation warning in 2.25.x first/

Suggest: deprecation for a release or two, so that users can upgrade and not immediately have to solve the problem (eg makes it easier to test pre-releases)

Are there examples of how to deprecate the default when the user does not set the field?