✂ removed deprecated `Numeric#ago` and friends

Replacements:

   5.ago   => 5.seconds.ago
   5.until => 5.seconds.until
   5.since => 5.seconds.since
   5.from_now => 5.seconds.from_now

The removed tests does not affect coverage – we have equivalent test cases in
the tests for `AS::Duration`.

See #12389 for the history and rationale behind this.

activesupport/CHANGELOG.md

+*   Removed deprecated `Numeric#ago` and friends
+
+    Replacements:
+
+       5.ago   => 5.seconds.ago
+       5.until => 5.seconds.until
+       5.since => 5.seconds.since
+       5.from_now => 5.seconds.from_now
+
+    See #12389 for the history and rationale behind this.
+
+    *Godfrey Chan*
+
 *   DateTime `advance` now supports partial days.
 
     Before:

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

@@ -61,25 +61,7 @@ def fortnights
   end
   alias :fortnight :fortnights
 
-  # Reads best without arguments:  10.minutes.ago
-  def ago(time = ::Time.current)
-    ActiveSupport::Deprecation.warn "Calling #ago or #until on a number (e.g. 5.ago) is deprecated and will be removed in the future, use 5.seconds.ago instead"
-    time - self
-  end
-
-  # Reads best with argument:  10.minutes.until(time)
-  alias :until :ago
-
-  # Reads best with argument:  10.minutes.since(time)
-  def since(time = ::Time.current)
-    ActiveSupport::Deprecation.warn "Calling #since or #from_now on a number (e.g. 5.since) is deprecated and will be removed in the future, use 5.seconds.since instead"
-    time + self
-  end
-
-  # Reads best without arguments:  10.minutes.from_now
-  alias :from_now :since
-
-  # Used with the standard time durations, like 1.hour.in_milliseconds -- 
+  # Used with the standard time durations, like 1.hour.in_milliseconds --
   # so we can feed them to JavaScript functions like getTime().
   def in_milliseconds
     self * 1000

activesupport/test/core_ext/numeric_ext_test.rb

@@ -22,18 +22,6 @@ def test_units
     end
   end
 
-  def test_deprecated_since_and_ago
-    assert_equal @now + 1, assert_deprecated { 1.since(@now) }
-    assert_equal @now - 1, assert_deprecated { 1.ago(@now) }
-  end
-
-  def test_deprecated_since_and_ago_without_argument
-    now = Time.now
-    assert assert_deprecated { 1.since } >= now + 1
-    now = Time.now
-    assert assert_deprecated { 1.ago } >= now - 1
-  end
-
   def test_irregular_durations
     assert_equal @now.advance(:days => 3000), 3000.days.since(@now)
     assert_equal @now.advance(:months => 1), 1.month.since(@now)
@@ -84,36 +72,6 @@ def test_add_one_year_to_leap_day
     assert_equal DateTime.civil(2005,2,28,15,15,10), DateTime.civil(2004,2,29,15,15,10) + 1.year
   end
 
-  def test_since_and_ago_anchored_to_time_now_when_time_zone_is_not_set
-    Time.zone = nil
-    with_env_tz 'US/Eastern' do
-      Time.stubs(:now).returns Time.local(2000)
-      # since
-      assert_not_instance_of ActiveSupport::TimeWithZone, assert_deprecated { 5.since }
-      assert_equal Time.local(2000,1,1,0,0,5), assert_deprecated { 5.since }
-      # ago
-      assert_not_instance_of ActiveSupport::TimeWithZone, assert_deprecated { 5.ago }
-      assert_equal Time.local(1999,12,31,23,59,55), assert_deprecated { 5.ago }
-    end
-  end
-
-  def test_since_and_ago_anchored_to_time_zone_now_when_time_zone_is_set
-    Time.zone = ActiveSupport::TimeZone['Eastern Time (US & Canada)']
-    with_env_tz 'US/Eastern' do
-      Time.stubs(:now).returns Time.local(2000)
-      # since
-      assert_instance_of ActiveSupport::TimeWithZone, assert_deprecated { 5.since }
-      assert_equal Time.utc(2000,1,1,0,0,5), assert_deprecated { 5.since.time }
-      assert_equal 'Eastern Time (US & Canada)',  assert_deprecated { 5.since.time_zone.name }
-      # ago
-      assert_instance_of ActiveSupport::TimeWithZone, assert_deprecated { 5.ago }
-      assert_equal Time.utc(1999,12,31,23,59,55), assert_deprecated { 5.ago.time }
-      assert_equal 'Eastern Time (US & Canada)', assert_deprecated { 5.ago.time_zone.name }
-    end
-  ensure
-    Time.zone = nil
-  end
-
   protected
     def with_env_tz(new_tz = 'US/Eastern')
       old_tz, ENV['TZ'] = ENV['TZ'], new_tz
@@ -435,7 +393,7 @@ def test_to_s__injected_on_proper_types
     assert_equal BigDecimal, BigDecimal("1000010").class
     assert_equal '1 Million', BigDecimal("1000010").to_s(:human)
   end
-  
+
   def test_in_milliseconds
     assert_equal 10_000, 10.seconds.in_milliseconds
   end