[GR-20126] Implement Numeric#clone method to return self.

PullRequest: truffleruby/1194

Author: bjfish

CHANGELOG.md

@@ -46,6 +46,7 @@ Bug fixes:
 * Fixed issue with `SystemCallError.new` setting a backtrace.
 * Fixed `BigDecimal#to_s` formatting issue (#1711).
 * Run `END` keyword block only once at exit.
+* Implement Numeric#clone method to return self.
 
 Compatibility:
 

spec/tags/core/kernel/clone_tags.txt

@@ -3,5 +3,3 @@ fails:Kernel#clone returns true for TrueClass
 fails:Kernel#clone returns false for FalseClass
 fails:Kernel#clone returns the same Integer for Integer
 fails:Kernel#clone returns the same Symbol for Symbol
-fails:Kernel#clone returns self for Complex
-fails:Kernel#clone returns self for Rational

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

@@ -29,9 +29,11 @@
 class Numeric
   include Comparable
 
-  # Always raises TypeError, as dup'ing Numerics is not allowed.
-  def initialize_copy(other)
-    raise TypeError, "copy of #{self.class} is not allowed"
+  def clone(freeze: true)
+    unless freeze
+      raise ArgumentError, "can't unfreeze #{self.class.name}"
+    end
+    self
   end
 
   def +@