patch 8.2.2297: Vim9: cannot set 'number' to a boolean value

Problem:    Vim9: cannot set 'number' to a boolean value.
Solution:   Use tv_get_bool(). (closes #7615)

src/evalvars.c

@@ -1370,8 +1370,14 @@ ex_let_one(
 			|| opt_type == gov_hidden_bool
 			|| opt_type == gov_hidden_number)
 			     && (tv->v_type != VAR_STRING || !in_vim9script()))
-		// number, possibly hidden
-		n = (long)tv_get_number(tv);
+	    {
+		if (opt_type == gov_bool || opt_type == gov_hidden_bool)
+		    // bool, possibly hidden
+		    n = (long)tv_get_bool(tv);
+		else
+		    // number, possibly hidden
+		    n = (long)tv_get_number(tv);
+	    }
 
 	    // Avoid setting a string option to the text "v:false" or similar.
 	    // In Vim9 script also don't convert a number to string.

src/testdir/test_vim9_assign.vim

@@ -161,6 +161,15 @@ def Test_assignment()
     assert_equal(6, &g:ts)
     &g:ts += 2
     assert_equal(8, &g:ts)
+
+    &number = true
+    assert_equal(true, &number)
+    &number = 0
+    assert_equal(false, &number)
+    &number = 1
+    assert_equal(true, &number)
+    &number = false
+    assert_equal(false, &number)
   END
   CheckDefAndScriptSuccess(lines)
 

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2297,
 /**/
     2296,
 /**/