diff --git a/src/evalfunc.c b/src/evalfunc.c
index 4f0bb5c..91fbc67 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -4808,7 +4808,7 @@
     {
 	mode = tv_get_string_buf(&argvars[1], buf);
 	if (argvars[2].v_type != VAR_UNKNOWN)
-	    abbr = (int)tv_get_number(&argvars[2]);
+	    abbr = (int)tv_get_bool(&argvars[2]);
     }
 
     if (map_to_exists(name, mode, abbr))
diff --git a/src/map.c b/src/map.c
index dd3139d..eed3a55 100644
--- a/src/map.c
+++ b/src/map.c
@@ -2204,9 +2204,9 @@
 	which = tv_get_string_buf_chk(&argvars[1], buf);
 	if (argvars[2].v_type != VAR_UNKNOWN)
 	{
-	    abbr = (int)tv_get_number(&argvars[2]);
+	    abbr = (int)tv_get_bool(&argvars[2]);
 	    if (argvars[3].v_type != VAR_UNKNOWN)
-		get_dict = (int)tv_get_number(&argvars[3]);
+		get_dict = (int)tv_get_bool(&argvars[3]);
 	}
     }
     else
diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index 04f8d7a..f79c2e0 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -1521,6 +1521,45 @@
   assert_equal(['./runtest.vim'], globpath('.', 'runtest.vim', true, true, true))
 enddef
 
+def Test_hasmapto()
+  assert_equal(0, hasmapto('foobar', 'i', true))
+  iabbrev foo foobar
+  assert_equal(1, hasmapto('foobar', 'i', true))
+  iunabbrev foo
+enddef
+
+def SID(): number
+  return expand('<SID>')
+          ->matchstr('<SNR>\zs\d\+\ze_$')
+          ->str2nr()
+enddef
+
+def Test_maparg()
+  let lnum = str2nr(expand('<sflnum>'))
+  map foo bar
+  assert_equal(#{
+        lnum: lnum + 1,
+        script: 0,
+        mode: ' ',
+        silent: 0,
+        noremap: 0,
+        lhs: 'foo',
+        lhsraw: 'foo',
+        nowait: 0,
+        expr: 0,
+        sid: SID(),
+        rhs: 'bar',
+        buffer: 0},
+        maparg('foo', '', false, true))
+  unmap foo
+enddef
+
+def Test_mapcheck()
+  iabbrev foo foobar
+  assert_equal('foobar', mapcheck('foo', 'i', true))
+  iunabbrev foo
+enddef
+
 def Test_recursive_call()
   assert_equal(6765, Fibonacci(20))
 enddef
diff --git a/src/version.c b/src/version.c
index 388be57..5232e84 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1577,
+/**/
     1576,
 /**/
     1575,