This helps to reduce repetition in code. Instead of doing "TYPE_*" everywhere, you can do `include Fiddle::Types`, and write the type name directly. This PR is to help reduce repetition when writing Fiddle code. Right now we have to type `TYPE_` everywhere, and you also have to include all of `Fiddle` to access `TYPE_*` constants. With this change, you can just include `Fiddle::Types` and it will shorten your code and also you only have to include those constants. Here is an example before: ```ruby require "fiddle" module MMAP # All Fiddle constants included include Fiddle def self.make_function name, args, ret ptr = Handle::DEFAULT[name] func = Function.new ptr, args, ret, name: name define_singleton_method name, &func.to_proc end make_function "munmap", [TYPE_VOIDP, # addr TYPE_SIZE_T], # len TYPE_INT make_function "mmap", [TYPE_VOIDP, TYPE_SIZE_T, TYPE_INT, TYPE_INT, TYPE_INT, TYPE_INT], TYPE_VOIDP make_function "mprotect", [TYPE_VOIDP, TYPE_SIZE_T, TYPE_INT], TYPE_INT end ``` After: ```ruby require "fiddle" module MMAP # Only type names included include Fiddle::Types def self.make_function name, args, ret ptr = Fiddle::Handle::DEFAULT[name] func = Fiddle::Function.new ptr, args, ret, name: name define_singleton_method name, &func.to_proc end make_function "munmap", [VOIDP, # addr SIZE_T], # len INT make_function "mmap", [VOIDP, SIZE_T, INT, INT, INT, INT], VOIDP make_function "mprotect", [VOIDP, SIZE_T, INT], INT end ``` We only need to import the type names, and you don't have to type `TYPE_` over and over. I think this makes Fiddle code easier to read. https://github.com/ruby/fiddle/commit/49fa7233e5 Co-authored-by: Sutou Kouhei <[email protected]>