diff --git a/src/testdir/test_vim9_disassemble.vim b/src/testdir/test_vim9_disassemble.vim
index 1582f12..78d0a62 100644
--- a/src/testdir/test_vim9_disassemble.vim
+++ b/src/testdir/test_vim9_disassemble.vim
@@ -1199,6 +1199,29 @@
   assert_equal(true, InvertBool())
 enddef
 
+def ReturnBool(): bool
+  let var: bool = "no" && [] || 123
+  return var
+enddef
+
+def Test_disassemble_return_bool()
+  let instr = execute('disassemble ReturnBool')
+  assert_match('ReturnBool\_s*' ..
+        'let var: bool = "no" && \[\] || 123\_s*' ..
+        '0 PUSHS "no"\_s*' ..
+        '1 JUMP_AND_KEEP_IF_FALSE -> 3\_s*' ..
+        '2 NEWLIST size 0\_s*' ..
+        '3 JUMP_AND_KEEP_IF_TRUE -> 5\_s*' ..
+        '4 PUSHNR 123\_s*' ..
+        '5 2BOOL (!!val)\_s*' ..
+        '\d STORE $0\_s*' ..
+        'return var\_s*' ..
+        '\d LOAD $0\_s*' ..   
+        '\d RETURN',
+        instr)
+  assert_equal(true, InvertBool())
+enddef
+
 def Test_disassemble_compare()
   let cases = [
         ['true == isFalse', 'COMPAREBOOL =='],
diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
index 36e39eb..c454ffe 100644
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -46,9 +46,16 @@
   assert_equal(v:false, bool2)
 
   let bool3: bool = 0
-  assert_equal(0, bool3)
+  assert_equal(false, bool3)
   let bool4: bool = 1
-  assert_equal(1, bool4)
+  assert_equal(true, bool4)
+
+  let bool5: bool = 'yes' && 'no'
+  assert_equal(true, bool5)
+  let bool6: bool = [] && 99
+  assert_equal(false, bool6)
+  let bool7: bool = [] || #{a: 1} && 99
+  assert_equal(true, bool7)
 
   let lines =<< trim END
     vim9script
@@ -57,8 +64,15 @@
       return flag
     enddef
     let flag: bool = GetFlag()
+    assert_equal(true, flag)
     flag = 0
+    # assert_equal(false, flag)
     flag = 1
+    # assert_equal(true, flag)
+    # flag = 99 || 123
+    # assert_equal(true, flag)
+    # flag = 'yes' && []
+    # assert_equal(false, flag)
   END
   CheckScriptSuccess(lines)
   CheckDefAndScriptFailure(['let x: bool = 2'], 'E1012:')