Add `Comparable#uniq`; CRuby2.4

mrbgems/mruby-enum-ext/mrblib/enum.rb

@@ -708,4 +708,20 @@ module Enumerable
   def nil.to_h
     {}
   end
+
+  def uniq(&block)
+    hash = {}
+    if block
+      self.each do|*v|
+        v = v.__svalue
+        hash[block.call(v)] ||= v
+      end
+    else
+      self.each do|*v|
+        v = v.__svalue
+        hash[v] ||= v
+      end
+    end
+    hash.values
+  end
 end

mrbgems/mruby-enum-lazy/mrblib/lazy.rb

@@ -158,6 +158,21 @@ class Enumerator
       }
     end
 
+    def uniq(&block)
+      hash = {}
+      Lazy.new(self){|yielder, val|
+        if block
+          v = block.call(val)
+        else
+          v = val
+        end
+        unless hash.include?(v)
+          yielder << val
+          hash[v] = val
+        end
+      }
+    end
+
     alias force to_a
   end
 end