Merge pull request #17816 from byroot/prevent-numeric-to-s-to-allocate-an-array

Prevent Numeric#to_s from allocating an array

activesupport/lib/active_support/core_ext/big_decimal/conversions.rb

@@ -3,14 +3,13 @@
 
 class BigDecimal
   DEFAULT_STRING_FORMAT = 'F'
-  def to_formatted_s(*args)
-    if args[0].is_a?(Symbol)
-      super
+  alias_method :to_default_s, :to_s
+
+  def to_s(format = nil, options = nil)
+    if format.is_a?(Symbol)
+      to_formatted_s(format, options || {})
     else
-      format = args[0] || DEFAULT_STRING_FORMAT
-      _original_to_s(format)
+      to_default_s(format || DEFAULT_STRING_FORMAT)
     end
   end
-  alias_method :_original_to_s, :to_s
-  alias_method :to_s, :to_formatted_s
 end

activesupport/lib/active_support/core_ext/numeric/conversions.rb

@@ -118,18 +118,28 @@ def to_formatted_s(format = :default, options = {})
     end
   end
 
-  [Float, Fixnum, Bignum, BigDecimal].each do |klass|
-    klass.send(:alias_method, :to_default_s, :to_s)
-
-    klass.send(:define_method, :to_s) do |*args|
-      if args[0].is_a?(Symbol)
-        format = args[0]
-        options = args[1] || {}
-
-        self.to_formatted_s(format, options)
-      else
-        to_default_s(*args)
+  [Fixnum, Bignum].each do |klass|
+    klass.class_eval do
+      alias_method :to_default_s, :to_s
+      def to_s(base_or_format = 10, options = nil)
+        if base_or_format.is_a?(Symbol)
+          to_formatted_s(base_or_format, options || {})
+        else
+          to_default_s(base_or_format)
+        end
       end
     end
   end
+
+  Float.class_eval do
+    alias_method :to_default_s, :to_s
+    def to_s(*args)
+      if args.empty?
+        to_default_s
+      else
+        to_formatted_s(*args)
+      end
+    end
+  end
+
 end