Replace deconstantize inflection with util

Library/Homebrew/formulary.rb

@@ -52,8 +52,8 @@ module Formulary
       next if type == :formulary_factory
 
       cached_objects.each_value do |klass|
-        namespace = klass.name.deconstantize
+        namespace = Utils::Inflection.deconstantize(klass.name)
-        next if namespace.deconstantize != name
+        next if Utils::Inflection.deconstantize(namespace) != name
 
         remove_const(Utils::Inflection.demodulize(namespace))
       end

Library/Homebrew/utils/inflection.rb

@@ -7,6 +7,22 @@ module Utils
   # @api private
   module Inflection
     extend T::Sig
+    # Removes the rightmost segment from the constant expression in the string.
+    #
+    #   deconstantize('Net::HTTP')   # => "Net"
+    #   deconstantize('::Net::HTTP') # => "::Net"
+    #   deconstantize('String')      # => ""
+    #   deconstantize('::String')    # => ""
+    #   deconstantize('')            # => ""
+    #
+    # See also #demodulize.
+    # @see https://github.com/rails/rails/blob/b0dd7c7/activesupport/lib/active_support/inflector/methods.rb#L247-L258
+    #   `ActiveSupport::Inflector.deconstantize`
+    sig { params(path: String).returns(String) }
+    def self.deconstantize(path)
+      T.must(path[0, path.rindex("::") || 0]) # implementation based on the one in facets' Module#spacename
+    end
+
     # Removes the module part from the expression in the string.
     #
     #   demodulize('ActiveSupport::Inflector::Inflections') # => "Inflections"