patch 8.2.1612: Vim9: cannot pass "true" to prop_remove()

Problem:    Vim9: cannot pass "true" to prop_remove().
Solution:   Use dict_get_bool(). (closes #6853)

Author: brammool

src/testdir/test_textprop.vim

@@ -321,6 +321,15 @@ func Test_prop_remove()
   bwipe!
 endfunc
 
+def Test_prop_remove_vim9()
+  new
+  call AddPropTypes()
+  call SetupPropsInFirstLine()
+  call assert_equal(1, prop_remove({'type': 'three', 'id': 13, 'both': true, 'all': true}))
+  call DeletePropTypes()
+  bwipe!
+enddef
+
 func SetupOneLine()
   call setline(1, 'xonex xtwoxx')
   normal gg0

src/textprop.c

@@ -805,11 +805,10 @@ f_prop_remove(typval_T *argvars, typval_T *rettv)
     linenr_T	lnum;
     dict_T	*dict;
     buf_T	*buf = curbuf;
-    dictitem_T	*di;
-    int		do_all = FALSE;
+    int		do_all;
     int		id = -1;
     int		type_id = -1;
-    int		both = FALSE;
+    int		both;
 
     rettv->vval.v_number = 0;
     if (argvars[0].v_type != VAR_DICT || argvars[0].vval.v_dict == NULL)
@@ -837,9 +836,7 @@ f_prop_remove(typval_T *argvars, typval_T *rettv)
     if (buf->b_ml.ml_mfp == NULL)
 	return;
 
-    di = dict_find(dict, (char_u*)"all", -1);
-    if (di != NULL)
-	do_all = dict_get_number(dict, (char_u *)"all");
+    do_all = dict_get_bool(dict, (char_u *)"all", FALSE);
 
     if (dict_find(dict, (char_u *)"id", -1) != NULL)
 	id = dict_get_number(dict, (char_u *)"id");
@@ -852,8 +849,8 @@ f_prop_remove(typval_T *argvars, typval_T *rettv)
 	    return;
 	type_id = type->pt_id;
     }
-    if (dict_find(dict, (char_u *)"both", -1) != NULL)
-	both = dict_get_number(dict, (char_u *)"both");
+    both = dict_get_bool(dict, (char_u *)"both", FALSE);
+
     if (id == -1 && type_id == -1)
     {
 	emsg(_("E968: Need at least one of 'id' or 'type'"));

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1612,
 /**/
     1611,
 /**/