Move Args#only_formula_or_cask to extend/os/linux

Library/Homebrew/cli/args.rb

@@ -96,7 +96,6 @@ module Homebrew
       end
 
       def only_formula_or_cask
-        return :formula if OS.linux? && !Homebrew::EnvConfig.developer?
         return :formula if formula? && !cask?
         return :cask if cask? && !formula?
       end
@@ -153,3 +152,5 @@ module Homebrew
     end
   end
 end
+
+require "extend/os/args"

Library/Homebrew/extend/os/args.rb

@@ -0,0 +1,4 @@
+# typed: false
+# frozen_string_literal: true
+
+require "extend/os/linux/args" if OS.linux?

Library/Homebrew/extend/os/linux/args.rb

@@ -0,0 +1,17 @@
+# typed: false
+# frozen_string_literal: true
+
+module Homebrew
+  module CLI
+    class Args
+      undef only_formula_or_cask
+
+      def only_formula_or_cask
+        # Make formula the default on linux for non-developers
+        return :formula unless Homebrew::EnvConfig.developer?
+        return :formula if formula? && !cask?
+        return :cask if cask? && !formula?
+      end
+    end
+  end
+end