moving leftover option proc into private function

lib/httpx/options.rb

@@ -251,14 +251,6 @@ module HTTPX
       end
     end
 
-    OTHER_LOOKUP = ->(obj, k, ivar_map) {
-      case obj
-      when Hash
-        obj[ivar_map[k]]
-      else
-        obj.instance_variable_get(k)
-      end
-    }
     def merge(other)
       ivar_map = nil
       other_ivars = case other
@@ -271,12 +263,12 @@ module HTTPX
 
       return self if other_ivars.empty?
 
-      return self if other_ivars.all? { |ivar| instance_variable_get(ivar) == OTHER_LOOKUP[other, ivar, ivar_map] }
+      return self if other_ivars.all? { |ivar| instance_variable_get(ivar) == access_option(other, ivar, ivar_map) }
 
       opts = dup
 
       other_ivars.each do |ivar|
-        v = OTHER_LOOKUP[other, ivar, ivar_map]
+        v = access_option(other, ivar, ivar_map)
 
         unless v
           opts.instance_variable_set(ivar, v)
@@ -355,5 +347,14 @@ module HTTPX
         instance_variable_set(:"@#{k}", value)
       end
     end
+
+    def access_option(obj, k, ivar_map)
+      case obj
+      when Hash
+        obj[ivar_map[k]]
+      else
+        obj.instance_variable_get(k)
+      end
+    end
   end
 end

sig/options.rbs

@@ -135,6 +135,8 @@ module HTTPX
     def initialize: (?options options) -> void
 
     def do_initialize: (?options options) -> void
+
+    def access_option: (Hash | Object obj, Symbol k, Hash[Symbol, Symbol] ivar_map)
   end
 
   type options = Options | Hash[Symbol, untyped]