diff --git a/src/testdir/test_termdebug.vim b/src/testdir/test_termdebug.vim
index 68bffd4..14d443a 100644
--- a/src/testdir/test_termdebug.vim
+++ b/src/testdir/test_termdebug.vim
@@ -230,26 +230,26 @@
 
 func Test_termdebug_mapping()
   %bw!
-  call assert_equal(maparg('K', 'n', 0, 1)->empty(), 1)
-  call assert_equal(maparg('-', 'n', 0, 1)->empty(), 1)
-  call assert_equal(maparg('+', 'n', 0, 1)->empty(), 1)
+  call assert_true(maparg('K', 'n', 0, 1)->empty())
+  call assert_true(maparg('-', 'n', 0, 1)->empty())
+  call assert_true(maparg('+', 'n', 0, 1)->empty())
   Termdebug
   call WaitForAssert({-> assert_equal(3, winnr('$'))})
   wincmd b
-  call assert_equal(maparg('K', 'n', 0, 1)->empty(), 0)
-  call assert_equal(maparg('-', 'n', 0, 1)->empty(), 0)
-  call assert_equal(maparg('+', 'n', 0, 1)->empty(), 0)
-  call assert_equal(maparg('K', 'n', 0, 1).buffer, 0)
-  call assert_equal(maparg('-', 'n', 0, 1).buffer, 0)
-  call assert_equal(maparg('+', 'n', 0, 1).buffer, 0)
-  call assert_equal(maparg('K', 'n', 0, 1).rhs, ':Evaluate<CR>')
+  call assert_false(maparg('K', 'n', 0, 1)->empty())
+  call assert_false(maparg('-', 'n', 0, 1)->empty())
+  call assert_false(maparg('+', 'n', 0, 1)->empty())
+  call assert_false(maparg('K', 'n', 0, 1).buffer)
+  call assert_false(maparg('-', 'n', 0, 1).buffer)
+  call assert_false(maparg('+', 'n', 0, 1).buffer)
+  call assert_equal(':Evaluate<CR>', maparg('K', 'n', 0, 1).rhs)
   wincmd t
   quit!
   redraw!
   call WaitForAssert({-> assert_equal(1, winnr('$'))})
-  call assert_equal(maparg('K', 'n', 0, 1)->empty(), 1)
-  call assert_equal(maparg('-', 'n', 0, 1)->empty(), 1)
-  call assert_equal(maparg('+', 'n', 0, 1)->empty(), 1)
+  call assert_true(maparg('K', 'n', 0, 1)->empty())
+  call assert_true(maparg('-', 'n', 0, 1)->empty())
+  call assert_true(maparg('+', 'n', 0, 1)->empty())
 
   %bw!
   nnoremap K :echom "K"<cr>
@@ -258,24 +258,24 @@
   Termdebug
   call WaitForAssert({-> assert_equal(3, winnr('$'))})
   wincmd b
-  call assert_equal(maparg('K', 'n', 0, 1)->empty(), 0)
-  call assert_equal(maparg('-', 'n', 0, 1)->empty(), 0)
-  call assert_equal(maparg('+', 'n', 0, 1)->empty(), 0)
-  call assert_equal(maparg('K', 'n', 0, 1).buffer, 0)
-  call assert_equal(maparg('-', 'n', 0, 1).buffer, 0)
-  call assert_equal(maparg('+', 'n', 0, 1).buffer, 0)
-  call assert_equal(maparg('K', 'n', 0, 1).rhs, ':Evaluate<CR>')
+  call assert_false(maparg('K', 'n', 0, 1)->empty())
+  call assert_false(maparg('-', 'n', 0, 1)->empty())
+  call assert_false(maparg('+', 'n', 0, 1)->empty())
+  call assert_false(maparg('K', 'n', 0, 1).buffer)
+  call assert_false(maparg('-', 'n', 0, 1).buffer)
+  call assert_false(maparg('+', 'n', 0, 1).buffer)
+  call assert_equal(':Evaluate<CR>', maparg('K', 'n', 0, 1).rhs)
   wincmd t
   quit!
   redraw!
   call WaitForAssert({-> assert_equal(1, winnr('$'))})
-  call assert_equal(maparg('K', 'n', 0, 1)->empty(), 0)
-  call assert_equal(maparg('-', 'n', 0, 1)->empty(), 0)
-  call assert_equal(maparg('+', 'n', 0, 1)->empty(), 0)
-  call assert_equal(maparg('K', 'n', 0, 1).buffer, 0)
-  call assert_equal(maparg('-', 'n', 0, 1).buffer, 0)
-  call assert_equal(maparg('+', 'n', 0, 1).buffer, 0)
-  call assert_equal(maparg('K', 'n', 0, 1).rhs, ':echom "K"<cr>')
+  call assert_false(maparg('K', 'n', 0, 1)->empty())
+  call assert_false(maparg('-', 'n', 0, 1)->empty())
+  call assert_false(maparg('+', 'n', 0, 1)->empty())
+  call assert_false(maparg('K', 'n', 0, 1).buffer)
+  call assert_false(maparg('-', 'n', 0, 1).buffer)
+  call assert_false(maparg('+', 'n', 0, 1).buffer)
+  call assert_equal(':echom "K"<cr>', maparg('K', 'n', 0, 1).rhs)
 
   %bw!
   nnoremap <buffer> K :echom "bK"<cr>
@@ -284,18 +284,18 @@
   Termdebug
   call WaitForAssert({-> assert_equal(3, winnr('$'))})
   wincmd b
-  call assert_equal(maparg('K', 'n', 0, 1).buffer, 1)
-  call assert_equal(maparg('-', 'n', 0, 1).buffer, 1)
-  call assert_equal(maparg('+', 'n', 0, 1).buffer, 1)
+  call assert_true(maparg('K', 'n', 0, 1).buffer)
+  call assert_true(maparg('-', 'n', 0, 1).buffer)
+  call assert_true(maparg('+', 'n', 0, 1).buffer)
   call assert_equal(maparg('K', 'n', 0, 1).rhs, ':echom "bK"<cr>')
   wincmd t
   quit!
   redraw!
   call WaitForAssert({-> assert_equal(1, winnr('$'))})
-  call assert_equal(maparg('K', 'n', 0, 1).buffer, 1)
-  call assert_equal(maparg('-', 'n', 0, 1).buffer, 1)
-  call assert_equal(maparg('+', 'n', 0, 1).buffer, 1)
-  call assert_equal(maparg('K', 'n', 0, 1).rhs, ':echom "bK"<cr>')
+  call assert_true(maparg('K', 'n', 0, 1).buffer)
+  call assert_true(maparg('-', 'n', 0, 1).buffer)
+  call assert_true(maparg('+', 'n', 0, 1).buffer)
+  call assert_equal(':echom "bK"<cr>', maparg('K', 'n', 0, 1).rhs)
 
   %bw!
 endfunc
diff --git a/src/version.c b/src/version.c
index 1ab889b..7d3a7e5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    427,
+/**/
     426,
 /**/
     425,