Fix occurrences Fixnum|Bignum

Related to https://github.com/rails/rails/commit/d4eb0dc89ee6b476e2e10869dc282a96f956c6c7#r27830891

actionview/test/template/date_helper_test.rb

@@ -141,10 +141,10 @@ def test_distance_in_words_with_mixed_argument_types
   end
 
   def test_distance_in_words_doesnt_use_the_quotient_operator
-    rubinius_skip "Date is written in Ruby and relies on Fixnum#/"
-    jruby_skip "Date is written in Ruby and relies on Fixnum#/"
+    rubinius_skip "Date is written in Ruby and relies on Integer#/"
+    jruby_skip "Date is written in Ruby and relies on Integer#/"
 
-    # Make sure that we avoid {Integer,Fixnum}#/ (redefined by mathn)
+    # Make sure that we avoid Integer#/ (redefined by mathn)
     Integer.send :private, :/
 
     from = Time.utc(2004, 6, 6, 21, 45, 0)

activerecord/test/cases/migration_test.rb

@@ -177,7 +177,7 @@ def test_add_table_with_decimals
     assert BigNumber.create(
       bank_balance: 1586.43,
       big_bank_balance: BigDecimal("1000234000567.95"),
-      world_population: 6000000000,
+      world_population: 2**62,
       my_house_population: 3,
       value_of_e: BigDecimal("2.7182818284590452353602875")
     )
@@ -191,10 +191,8 @@ def test_add_table_with_decimals
     assert_not_nil b.my_house_population
     assert_not_nil b.value_of_e
 
-    # TODO: set world_population >= 2**62 to cover 64-bit platforms and test
-    # is_a?(Bignum)
     assert_kind_of Integer, b.world_population
-    assert_equal 6000000000, b.world_population
+    assert_equal 2**62, b.world_population
     assert_kind_of Integer, b.my_house_population
     assert_equal 3, b.my_house_population
     assert_kind_of BigDecimal, b.bank_balance

activerecord/test/cases/numeric_data_test.rb

@@ -19,7 +19,7 @@ def test_numeric_fields
     m = NumericData.new(
       bank_balance: 1586.43,
       big_bank_balance: BigDecimal("1000234000567.95"),
-      world_population: 6000000000,
+      world_population: 2**62,
       my_house_population: 3
     )
     assert m.save
@@ -27,11 +27,8 @@ def test_numeric_fields
     m1 = NumericData.find(m.id)
     assert_not_nil m1
 
-    # As with migration_test.rb, we should make world_population >= 2**62
-    # to cover 64-bit platforms and test it is a Bignum, but the main thing
-    # is that it's an Integer.
     assert_kind_of Integer, m1.world_population
-    assert_equal 6000000000, m1.world_population
+    assert_equal 2**62, m1.world_population
 
     assert_kind_of Integer, m1.my_house_population
     assert_equal 3, m1.my_house_population
@@ -47,7 +44,7 @@ def test_numeric_fields_with_scale
     m = NumericData.new(
       bank_balance: 1586.43122334,
       big_bank_balance: BigDecimal("234000567.952344"),
-      world_population: 6000000000,
+      world_population: 2**62,
       my_house_population: 3
     )
     assert m.save
@@ -55,11 +52,8 @@ def test_numeric_fields_with_scale
     m1 = NumericData.find(m.id)
     assert_not_nil m1
 
-    # As with migration_test.rb, we should make world_population >= 2**62
-    # to cover 64-bit platforms and test it is a Bignum, but the main thing
-    # is that it's an Integer.
     assert_kind_of Integer, m1.world_population
-    assert_equal 6000000000, m1.world_population
+    assert_equal 2**62, m1.world_population
 
     assert_kind_of Integer, m1.my_house_population
     assert_equal 3, m1.my_house_population

activerecord/test/migrations/decimal/1_give_me_big_numbers.rb

@@ -5,7 +5,7 @@ def self.up
     create_table :big_numbers do |table|
       table.column :bank_balance, :decimal, precision: 10, scale: 2
       table.column :big_bank_balance, :decimal, precision: 15, scale: 2
-      table.column :world_population, :decimal, precision: 10
+      table.column :world_population, :decimal, precision: 20
       table.column :my_house_population, :decimal, precision: 2
       table.column :value_of_e, :decimal
     end

activerecord/test/schema/schema.rb

@@ -547,7 +547,7 @@
   create_table :numeric_data, force: true do |t|
     t.decimal :bank_balance, precision: 10, scale: 2
     t.decimal :big_bank_balance, precision: 15, scale: 2
-    t.decimal :world_population, precision: 10, scale: 0
+    t.decimal :world_population, precision: 20, scale: 0
     t.decimal :my_house_population, precision: 2, scale: 0
     t.decimal :decimal_number_with_default, precision: 3, scale: 2, default: 2.78
     t.float   :temperature