yeah, but that is only used for Windows

lib/locale/driver/win32.rb
25:require "fiddle/import"
34:        extend Fiddle::Importer

BTW - fiddle seems quite nice. Have a Shared Object and want to use a C function? Easy! https://github.com/ruby/fiddle/blob/master/README.md?plain=1#L31 If it were not for Fiddle, you would add another component to Vanagon and go through MakeMakefile - on Windows :S