NumberHelper: handle very large numbers

Fixes rails#49461

Co-authored-by: fatkodima <[email protected]>

Author: ghiculescu

activesupport/lib/active_support/number_helper/number_converter.rb

@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require "bigdecimal"
+require "bigdecimal/util"
 require "active_support/core_ext/big_decimal/conversions"
 require "active_support/core_ext/hash/keys"
 require "active_support/i18n"
@@ -128,7 +130,7 @@ def initialize(number, options)
       def execute
         if !number
           nil
-        elsif validate_float? && !valid_float?
+        elsif validate_float? && !valid_bigdecimal
           number
         else
           convert
@@ -173,8 +175,13 @@ def default_value(key)
           key.split(".").reduce(DEFAULTS) { |defaults, k| defaults[k.to_sym] }
         end
 
-        def valid_float?
-          Float(number, exception: false)
+        def valid_bigdecimal
+          case number
+          when Float, Rational
+            number.to_d(0)
+          else
+            BigDecimal(number, exception: false)
+          end
         end
     end
   end

activesupport/lib/active_support/number_helper/number_to_currency_converter.rb

@@ -10,13 +10,13 @@ class NumberToCurrencyConverter < NumberConverter # :nodoc:
       def convert
         format = options[:format]
 
-        number_f = valid_float?
-        if number_f
-          if number_f.negative?
-            number_f = number_f.abs
-            format = options[:negative_format] if (number_f * 10**options[:precision]) >= 0.5
+        number_d = valid_bigdecimal
+        if number_d
+          if number_d.negative?
+            number_d = number_d.abs
+            format = options[:negative_format] if (number_d * 10**options[:precision]) >= 0.5
           end
-          number_s = NumberToRoundedConverter.convert(number_f, options)
+          number_s = NumberToRoundedConverter.convert(number_d, options)
         else
           number_s = number.to_s.strip
           format = options[:negative_format] if number_s.sub!(/^-/, "")

activesupport/test/number_helper_test.rb

@@ -69,6 +69,7 @@ def test_number_to_phone
 
       def test_number_to_currency
         [@instance_with_helpers, TestClassWithClassNumberHelpers, ActiveSupport::NumberHelper].each do |number_helper|
+          assert_equal("$123,456,789,012,345,678.91", number_helper.number_to_currency("123456789012345678.91"))
           assert_equal("$1,234,567,890.50", number_helper.number_to_currency(1234567890.50))
           assert_equal("$1,234,567,890.51", number_helper.number_to_currency(1234567890.506))
           assert_equal("-$1,234,567,890.50", number_helper.number_to_currency(-1234567890.50))