There is not a single line of code in all of Rails that makes use of the .find_all template API, that doesn’t look like this: lookup.find_all(*args).first. Getting rid of the unnecessary Array handling would simplify the implementation.
Therefore I would like to propose to deprecate and remove the AV::Resolver#find_all/find_templates, AV::PathSet#find_all and LookupContext#find_all methods and replace them with AV::Resolver#find/find_template, AV::PathSet#find/find_if_exists and LookupContext#find/find_if_exists. Some of the classes already provide the #find methods so that would be mostly about replacing lookup.find_all(*args).first with lookup.find_if_exists(*args).
Would be willing to provide a patch.
/cc @josevalim.
