diff --git a/src/evalfunc.c b/src/evalfunc.c
index c1c8c23..066716a 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -1258,8 +1258,14 @@
 		&& !tv_check_lock(b->bv_lock,
 					 (char_u *)N_("add() argument"), TRUE))
 	{
-	    ga_append(&b->bv_ga, (char_u)tv_get_number(&argvars[1]));
-	    copy_tv(&argvars[0], rettv);
+	    int		error = FALSE;
+	    varnumber_T n = tv_get_number_chk(&argvars[1], &error);
+
+	    if (!error)
+	    {
+		ga_append(&b->bv_ga, (int)n);
+		copy_tv(&argvars[0], rettv);
+	    }
 	}
     }
     else
@@ -3196,7 +3202,6 @@
 
 	case VAR_BLOB:
 	    n = argvars[0].vval.v_blob == NULL
-		|| argvars[0].vval.v_blob->bv_ga.ga_data == NULL
 		|| argvars[0].vval.v_blob->bv_ga.ga_len == 0;
 	    break;
 
@@ -7029,6 +7034,13 @@
 	b = argvars[0].vval.v_blob;
 	if (b == NULL)
 	    return;
+	if (start < 0)
+	{
+	    start = blob_len(b) + start;
+	    if (start < 0)
+		start = 0;
+	}
+
 	for (idx = start; idx < blob_len(b); ++idx)
 	{
 	    tv.v_type = VAR_NUMBER;
diff --git a/src/testdir/test_blob.vim b/src/testdir/test_blob.vim
index 550b8f1..ec3de89 100644
--- a/src/testdir/test_blob.vim
+++ b/src/testdir/test_blob.vim
@@ -96,6 +96,8 @@
   call assert_true(b1 != b2)
   call assert_true(b1 != b3)
   call assert_true(b1 == 0z0011)
+  call assert_fails('echo b1 == 9', 'E977:')
+  call assert_fails('echo b1 != 9', 'E977:')
 
   call assert_false(b1 is b2)
   let b2 = b1
@@ -145,6 +147,22 @@
   call assert_equal(0zDEADBEEF, b)
 endfunc
 
+func Test_blob_add()
+  let b = 0z0011
+  call add(b, 0x22)
+  call assert_equal(0z001122, b)
+  call add(b, '51')
+  call assert_equal(0z00112233, b)
+
+  call assert_fails('call add(b, [9])', 'E745:')
+endfunc
+
+func Test_blob_empty()
+  call assert_false(empty(0z001122))
+  call assert_true(empty(0z))
+  call assert_true(empty(test_null_blob()))
+endfunc
+
 " Test removing items in blob
 func Test_blob_func_remove()
   " Test removing 1 element
@@ -198,11 +216,19 @@
   let b = 0zDEADBEEF
   call map(b, 'v:val + 1')
   call assert_equal(0zDFAEBFF0, b)
+
+  call assert_fails("call map(b, '[9]')", 'E978:')
 endfunc
 
 func Test_blob_index()
   call assert_equal(2, index(0zDEADBEEF, 0xBE))
   call assert_equal(-1, index(0zDEADBEEF, 0))
+  call assert_equal(2, index(0z11111111, 0x11, 2))
+  call assert_equal(3, index(0z11110111, 0x11, 2))
+  call assert_equal(2, index(0z11111111, 0x11, -2))
+  call assert_equal(3, index(0z11110111, 0x11, -2))
+
+  call assert_fails('call index("asdf", 0)', 'E714:')
 endfunc
 
 func Test_blob_insert()
@@ -213,6 +239,10 @@
   let b = 0zDEADBEEF
   call insert(b, 0x33, 2)
   call assert_equal(0zDEAD33BEEF, b)
+
+  call assert_fails('call insert(b, -1)', 'E475:')
+  call assert_fails('call insert(b, 257)', 'E475:')
+  call assert_fails('call insert(b, 0, [9])', 'E745:')
 endfunc
 
 func Test_blob_reverse()
diff --git a/src/testdir/test_eval_stuff.vim b/src/testdir/test_eval_stuff.vim
index dc3cb89..c7b970a 100644
--- a/src/testdir/test_eval_stuff.vim
+++ b/src/testdir/test_eval_stuff.vim
@@ -69,3 +69,21 @@
   call assert_fails("for x in 'asdf'", 'E714:')
   call assert_fails("for x in {'a': 9}", 'E714:')
 endfunc
+
+func Test_readfile_binary()
+  new
+  call setline(1, ['one', 'two', 'three'])
+  setlocal ff=dos
+  write XReadfile
+  let lines = readfile('XReadfile')
+  call assert_equal(['one', 'two', 'three'], lines)
+  let lines = readfile('XReadfile', '', 2)
+  call assert_equal(['one', 'two'], lines)
+  let lines = readfile('XReadfile', 'b')
+  call assert_equal(["one\r", "two\r", "three\r", ""], lines)
+  let lines = readfile('XReadfile', 'b', 2)
+  call assert_equal(["one\r", "two\r"], lines)
+
+  bwipe!
+  call delete('XReadfile')
+endfunc
diff --git a/src/version.c b/src/version.c
index a7ed174..ec50b49 100644
--- a/src/version.c
+++ b/src/version.c
@@ -796,6 +796,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    742,
+/**/
     741,
 /**/
     740,