README.md in metka-2.2.1 vs README.md in metka-2.3.0

@@ -71,12 +71,15 @@
 
 Song.with_all_tags('top, 1990')
 #=> []
 
 Song.with_all_tags('')
-#=> []
+#=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
 
+Song.with_all_tags(nil)
+#=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
+
 Song.with_all_genres('rock')
 #=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
 ```
 
 ### .with_any_#{column_name}
@@ -87,12 +90,15 @@
 
 Song.with_any_tags('chill, 1980')
 #=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
 
 Song.with_any_tags('')
-#=> []
+#=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
 
+Song.with_any_tags(nil)
+#=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
+
 Song.with_any_genres('rock, rap')
 #=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
 ```
 
 ### .without_all_#{column_name}
@@ -103,12 +109,15 @@
 
 Song.without_all_tags('top, 1990')
 #=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
 
 Song.without_all_tags('')
-#=> []
+#=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
 
+Song.without_all_tags(nil)
+#=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
+
 Song.without_all_genres('rock, pop')
 #=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
 
 Song.without_all_genres('rock')
 #=> []
@@ -125,11 +134,14 @@
 
 Song.without_any_genres('rock, pop')
 #=> []
 
 Song.without_any_genres('')
-#=> []
+#=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
+
+Song.without_any_genres(nil)
+#=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
 ```
 
 ### .tagged_with
 
 ```ruby
@@ -138,12 +150,15 @@
 
 Song.tagged_with('top, 1990')
 #=> []
 
 Song.tagged_with('')
-#=> []
+#=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
 
+Song.tagged_with(nil)
+#=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
+
 Song.tagged_with('rock')
 #=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
 
 Song.tagged_with('rock', join_operator: Metka::And)
 #=> []
@@ -153,11 +168,11 @@
 
 Song.tagged_with('chill, 1980', any: true)
 #=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
 
 Song.tagged_with('', any: true)
-#=> []
+#=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
 
 Song.tagged_with('rock, rap', any: true, on: ['genres'])
 #=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
 
 Song.without_all_tags('top')
@@ -165,10 +180,10 @@
 
 Song.tagged_with('top, 1990', exclude: true)
 #=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
 
 Song.tagged_with('', exclude: true)
-#=> []
+#=> [#<Song id: 1, title: 'Migrate tags in Rails to PostgreSQL', tags: ['top', 'chill'], genres: ['rock', 'jazz', 'pop']]
 
 Song.tagged_with('top, 1990', any: true, exclude: true)
 #=> []
 
 Song.tagged_with('1990, 1980', any: true, exclude: true)