diff --git a/Library/Homebrew/cask/cask.rb b/Library/Homebrew/cask/cask.rb
index b209511a94..4b612bd0c6 100644
--- a/Library/Homebrew/cask/cask.rb
+++ b/Library/Homebrew/cask/cask.rb
@@ -15,21 +15,20 @@ module Cask
   class Cask
     extend T::Sig
 
-    extend Enumerable
     extend Forwardable
     extend Searchable
     include Metadata
 
     attr_reader :token, :sourcefile_path, :source, :config, :default_config
 
-    def self.each(&block)
-      return to_enum unless block
-
-      Tap.flat_map(&:cask_files).each do |f|
-        yield CaskLoader::FromTapPathLoader.new(f).load(config: nil)
+    def self.all
+      Tap.flat_map(&:cask_files).map do |f|
+        CaskLoader::FromTapPathLoader.new(f).load(config: nil)
       rescue CaskUnreadableError => e
         opoo e.message
-      end
+
+        nil
+      end.compact
     end
 
     def tap
diff --git a/Library/Homebrew/cmd/deps.rb b/Library/Homebrew/cmd/deps.rb
index 534a49d1a8..a9f0ac3cd5 100644
--- a/Library/Homebrew/cmd/deps.rb
+++ b/Library/Homebrew/cmd/deps.rb
@@ -121,7 +121,7 @@ module Homebrew
       puts_deps_tree dependents, recursive: recursive, args: args
       return
     elsif args.all?
-      puts_deps sorted_dependents(Formula.to_a + Cask::Cask.to_a), recursive: recursive, args: args
+      puts_deps sorted_dependents(Formula.all + Cask::Cask.all), recursive: recursive, args: args
       return
     elsif !args.no_named? && args.for_each?
       puts_deps sorted_dependents(args.named.to_formulae_and_casks), recursive: recursive, args: args
diff --git a/Library/Homebrew/cmd/info.rb b/Library/Homebrew/cmd/info.rb
index 0c36d9b9d0..01433be06d 100644
--- a/Library/Homebrew/cmd/info.rb
+++ b/Library/Homebrew/cmd/info.rb
@@ -207,7 +207,7 @@ module Homebrew
       end
     when :v2
       formulae, casks = if args.all?
-        [Formula.sort, Cask::Cask.to_a.sort_by(&:full_name)]
+        [Formula.sort, Cask::Cask.all.sort_by(&:full_name)]
       elsif args.installed?
         [Formula.installed.sort, Cask::Caskroom.casks.sort_by(&:full_name)]
       else
diff --git a/Library/Homebrew/cmd/options.rb b/Library/Homebrew/cmd/options.rb
index a34d055c9d..c97d57d528 100644
--- a/Library/Homebrew/cmd/options.rb
+++ b/Library/Homebrew/cmd/options.rb
@@ -34,7 +34,7 @@ module Homebrew
     args = options_args.parse
 
     if args.all?
-      puts_options Formula.to_a.sort, args: args
+      puts_options Formula.all.sort, args: args
     elsif args.installed?
       puts_options Formula.installed.sort, args: args
     elsif args.command.present?
diff --git a/Library/Homebrew/cmd/update-report.rb b/Library/Homebrew/cmd/update-report.rb
index fff584325c..aa5fb7efea 100644
--- a/Library/Homebrew/cmd/update-report.rb
+++ b/Library/Homebrew/cmd/update-report.rb
@@ -593,6 +593,7 @@ class ReporterHub
   private
 
   def dump_formula_report(key, title)
+    # TODO: 3.4.0: odisabled the old functionality and make this default
     only_installed = Homebrew::EnvConfig.update_report_only_installed?
 
     formulae = select_formula(key).sort.map do |name, new_name|
diff --git a/Library/Homebrew/cmd/uses.rb b/Library/Homebrew/cmd/uses.rb
index 3840aa361d..926b5991a8 100644
--- a/Library/Homebrew/cmd/uses.rb
+++ b/Library/Homebrew/cmd/uses.rb
@@ -101,10 +101,10 @@ module Homebrew
       deps
     else
       if show_formulae_and_casks || args.formula?
-        deps += args.installed? ? Formula.installed : Formula.to_a
+        deps += args.installed? ? Formula.installed : Formula.all
       end
       if show_formulae_and_casks || args.cask?
-        deps += args.installed? ? Cask::Caskroom.casks : Cask::Cask.to_a
+        deps += args.installed? ? Cask::Caskroom.casks : Cask::Cask.all
       end
 
       select_used_dependents(dependents(deps), used_formulae, recursive, includes, ignores)
diff --git a/Library/Homebrew/compat/cask.rb b/Library/Homebrew/compat/cask.rb
new file mode 100644
index 0000000000..daec219d0e
--- /dev/null
+++ b/Library/Homebrew/compat/cask.rb
@@ -0,0 +1,21 @@
+# typed: true
+# frozen_string_literal: true
+
+module Cask
+  class Cask
+    extend Enumerable
+
+    def self.each(&block)
+      # TODO: 3.4.0: odeprecated "`Enumerable` methods on `Cask::Cask`",
+      #              "`Cask::Cask.all` (but avoid looping over all casks, it's slow and insecure)"
+
+      return to_enum unless block
+
+      Tap.flat_map(&:cask_files).each do |f|
+        yield CaskLoader::FromTapPathLoader.new(f).load(config: nil)
+      rescue CaskUnreadableError => e
+        opoo e.message
+      end
+    end
+  end
+end
diff --git a/Library/Homebrew/compat/formula.rb b/Library/Homebrew/compat/formula.rb
new file mode 100644
index 0000000000..013759f55d
--- /dev/null
+++ b/Library/Homebrew/compat/formula.rb
@@ -0,0 +1,20 @@
+# typed: true
+# frozen_string_literal: true
+
+class Formula
+  extend Enumerable
+
+  def self.each(&_block)
+    # TODO: 3.4.0: odeprecated "`Enumerable` methods on `Formula`",
+    #              "`Formula.all` (but avoid looping over all formulae, it's slow and insecure)"
+
+    files.each do |file|
+      yield Formulary.factory(file)
+    rescue FormulaUnavailableError, FormulaUnreadableError => e
+      # Don't let one broken formula break commands. But do complain.
+      onoe "Failed to import: #{file}"
+      $stderr.puts e
+      next
+    end
+  end
+end
diff --git a/Library/Homebrew/compat/late.rb b/Library/Homebrew/compat/late.rb
index b4806eee61..6e36cebe11 100644
--- a/Library/Homebrew/compat/late.rb
+++ b/Library/Homebrew/compat/late.rb
@@ -1,2 +1,5 @@
 # typed: strict
 # frozen_string_literal: true
+
+require "compat/formula"
+require "compat/cask"
diff --git a/Library/Homebrew/description_cache_store.rb b/Library/Homebrew/description_cache_store.rb
index b867f51c09..22a2a6b8dc 100644
--- a/Library/Homebrew/description_cache_store.rb
+++ b/Library/Homebrew/description_cache_store.rb
@@ -36,7 +36,7 @@ class DescriptionCacheStore < CacheStore
   def populate_if_empty!
     return unless database.empty?
 
-    Formula.each { |f| update!(f.full_name, f.desc) }
+    Formula.all.each { |f| update!(f.full_name, f.desc) }
   end
 
   # Use an update report to update the {DescriptionCacheStore}.
diff --git a/Library/Homebrew/dev-cmd/audit.rb b/Library/Homebrew/dev-cmd/audit.rb
index b3b03d8bb4..9bd543366a 100644
--- a/Library/Homebrew/dev-cmd/audit.rb
+++ b/Library/Homebrew/dev-cmd/audit.rb
@@ -121,7 +121,7 @@ module Homebrew
       end
     elsif args.no_named?
       no_named_args = true
-      [Formula, Cask::Cask.to_a]
+      [Formula.all, Cask::Cask.all]
     else
       args.named.to_formulae_and_casks
           .partition { |formula_or_cask| formula_or_cask.is_a?(Formula) }
diff --git a/Library/Homebrew/dev-cmd/bump-formula-pr.rb b/Library/Homebrew/dev-cmd/bump-formula-pr.rb
index dc29cc16e2..c2491dba3b 100644
--- a/Library/Homebrew/dev-cmd/bump-formula-pr.rb
+++ b/Library/Homebrew/dev-cmd/bump-formula-pr.rb
@@ -367,7 +367,7 @@ module Homebrew
     base_url = url_split.first(components_to_match).join("/")
     base_url = /#{Regexp.escape(base_url)}/
     guesses = []
-    Formula.each do |f|
+    Formula.all.each do |f|
       guesses << f if f.stable&.url&.match(base_url)
     end
     return guesses.shift if guesses.count == 1
diff --git a/Library/Homebrew/dev-cmd/livecheck.rb b/Library/Homebrew/dev-cmd/livecheck.rb
index c702bc4fc3..d857bd3d99 100644
--- a/Library/Homebrew/dev-cmd/livecheck.rb
+++ b/Library/Homebrew/dev-cmd/livecheck.rb
@@ -71,8 +71,8 @@ module Homebrew
       casks = args.formula? ? [] : Cask::Caskroom.casks
       formulae + casks
     elsif args.all?
-      formulae = args.cask? ? [] : Formula.to_a
-      casks = args.formula? ? [] : Cask::Cask.to_a
+      formulae = args.cask? ? [] : Formula.all
+      casks = args.formula? ? [] : Cask::Cask.all
       formulae + casks
     elsif args.named.present?
       if args.formula?
diff --git a/Library/Homebrew/dev-cmd/unbottled.rb b/Library/Homebrew/dev-cmd/unbottled.rb
index 882ae23127..950e69d25d 100644
--- a/Library/Homebrew/dev-cmd/unbottled.rb
+++ b/Library/Homebrew/dev-cmd/unbottled.rb
@@ -79,9 +79,9 @@ module Homebrew
     if args.named.present?
       formulae = all_formulae = args.named.to_formulae
     elsif args.total?
-      formulae = all_formulae = Formula.to_a
+      formulae = all_formulae = Formula.all
     elsif args.dependents?
-      formulae = all_formulae = Formula.to_a
+      formulae = all_formulae = Formula.all
 
       @sort = " (sorted by number of dependents)"
     else
diff --git a/Library/Homebrew/extend/os/mac/search.rb b/Library/Homebrew/extend/os/mac/search.rb
index a2f2af139b..4fee7f8f37 100644
--- a/Library/Homebrew/extend/os/mac/search.rb
+++ b/Library/Homebrew/extend/os/mac/search.rb
@@ -15,7 +15,7 @@ module Homebrew
         return if args.formula?
 
         ohai "Casks"
-        Cask::Cask.to_a.extend(Searchable)
+        Cask::Cask.all.extend(Searchable)
                   .search(string_or_regex, &:name)
                   .each do |cask|
           puts "#{Tty.bold}#{cask.token}:#{Tty.reset} #{cask.name.join(", ")}"
diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 55e6db6273..76b6545a24 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -64,8 +64,7 @@ class Formula
   include Utils::Shebang
   include Utils::Shell
   include Context
-  include OnOS # TODO: 3.3.0: deprecate OnOS usage in instance methods.
-  extend Enumerable
+  include OnOS # TODO: 3.4.0: odeprecate OnOS usage in instance methods.
   extend Forwardable
   extend Cachable
   extend Predicable
@@ -1682,16 +1681,18 @@ class Formula
     @full_names ||= core_names + tap_names
   end
 
+  # an array of all {Formula}
   # @private
-  def self.each(&_block)
-    files.each do |file|
-      yield Formulary.factory(file)
+  def self.all
+    files.map do |file|
+      Formulary.factory(file)
     rescue FormulaUnavailableError, FormulaUnreadableError => e
       # Don't let one broken formula break commands. But do complain.
       onoe "Failed to import: #{file}"
       $stderr.puts e
-      next
-    end
+
+      nil
+    end.compact
   end
 
   # An array of all racks currently installed.