Use be instead of eq for identity comparison

spec/predicate_spec.rb

@@ -8,12 +8,12 @@
     end
   end
 
-  it 'responds to predicate-style methods with false' do
-    expect(null.too_much_coffee?).to eq(false)
+  it 'does not overwrite respond_to?' do
+    expect(null.respond_to?(:==)).to be(true)
   end
 
   it 'responds to other methods with nil' do
-    expect(null.foobar).to eq(nil)
+    expect(null.foobar).to be(nil)
   end
 
   describe '(black hole)' do
@@ -25,7 +25,7 @@
     end
 
     it 'responds to predicate-style methods with false' do
-      expect(null.too_much_coffee?).to eq(false)
+      expect(null.too_much_coffee?).to be(false)
     end
 
     it 'responds to other methods with self' do
@@ -42,7 +42,7 @@
     end
 
     it 'responds to predicate-style methods with false' do
-      expect(null.too_much_coffee?).to eq(false)
+      expect(null.too_much_coffee?).to be(false)
     end
 
     it 'responds to other methods with self' do
@@ -69,7 +69,7 @@ def origin
     end
 
     it 'responds to predicate-style methods with false' do
-      expect(null.black?).to eq(false)
+      expect(null.black?).to be(false)
     end
 
     it 'responds to other methods with nil' do