Implement Array#minmax to replace Enumerable#minmax

CHANGELOG.md

@@ -20,6 +20,7 @@ Compatibility:
 * Add support for `Integer#[Range]` and `Integer#[start, length]` (#2182, @gogainda).
 * Allow private calls with `self` as an explicit receiver (#2196, @wildmaples).
 * Fixed `:perm` parameter for `File.write`.
+* Added a `Array#minmax` to override `Enumerable#minmax` (#2199, @wildmaples).
 
 Performance:
 

spec/tags/truffle/methods_tags.txt

@@ -92,7 +92,6 @@ fails:Public methods on Digest::Base should include reset
 fails:Public methods on Digest::MD5 should not include block_length
 fails:Public methods on Digest::SHA1 should not include block_length
 fails:Public methods on Array should include deconstruct
-fails:Public methods on Array should include minmax
 fails:Public methods on Complex should include <=>
 fails:Public methods on ENV.singleton_class should include freeze
 fails:Public methods on Enumerable should include filter_map

src/main/ruby/truffleruby/core/array.rb

@@ -701,6 +701,14 @@ def min(n=undefined)
     super(n)
   end
 
+  def minmax(&block)
+    if block_given?
+      super(&block)
+    else
+      [self.min, self.max]
+    end
+  end
+
   def permutation_size(num)
     n = self.size
     if Primitive.undefined? num