✨ Delegate VanishedData#each => #uids.each_number

`VanishedData#to_a` is already provided, but using `#each` would be
safer and simpler in many scenarios.

Author: nevans

lib/net/imap/vanished_data.rb

@@ -51,6 +51,15 @@ def initialize(uids:, earlier:)
       # See SequenceSet#numbers.
       def to_a; uids.numbers end
 
+      # Yields each UID in #uids and returns +self+.  Returns an Enumerator when
+      # no block is given.
+      #
+      # See SequenceSet#each_number.
+      def each(&)
+        return to_enum unless block_given?
+        uids.each_number(&)
+        self
+      end
     end
   end
 end

test/net/imap/test_vanished_data.rb

@@ -71,10 +71,20 @@ class VanishedDataTest < Net::IMAP::TestCase
     assert_raise DataFormatError do VanishedData[nil,     nil] end
   end
 
-  test "#to_a delegates to uids (SequenceSet#to_a)" do
+  test "#to_a delegates to uids (SequenceSet#numbers)" do
     assert_equal [1, 2, 3, 4], VanishedData["1:4", true].to_a
   end
 
+  test "#each delegates to uids (SequenceSert#each_number)" do
+    assert_kind_of Enumerator, VanishedData["1:4", true].each
+    assert_equal [1, 2, 3, 4], VanishedData["1:4", true].each.to_a
+    ary = []
+    vanished = VanishedData["5:6,100", true]
+    returned = vanished.each do ary << _1 end
+    assert_same vanished, returned
+    assert_equal [5, 6, 100], ary
+  end
+
   test "#deconstruct_keys returns uids and earlier" do
     assert_equal({uids: SequenceSet[1,9], earlier: true},
                  VanishedData["1,9", true].deconstruct_keys([:uids, :earlier]))