x.json2: add a convenience Any.as_map_of_strings/0 method

vlib/x/json2/json2.v

@@ -231,6 +231,26 @@ pub fn (f Any) as_map() map[string]Any {
 	}
 }
 
+pub fn (f Any) as_map_of_strings() map[string]string {
+	if f is map[string]Any {
+		mut ms := map[string]string{}
+		for k, v in f {
+			ms[k] = v.str()
+		}
+		return ms
+	}
+	if f is []Any {
+		mut ms := map[string]string{}
+		for i, fi in f {
+			ms['${i}'] = fi.str()
+		}
+		return ms
+	}
+	return {
+		'0': f.str()
+	}
+}
+
 // to_time uses `Any` as a time.Time.
 pub fn (f Any) to_time() !time.Time {
 	match f {

vlib/x/json2/tests/any_test.v

@@ -89,6 +89,15 @@ fn test_as_map() {
 	assert sample_data['obj'] or { 0 }.as_map()['foo'] or { 0 }.int() == 10
 }
 
+fn test_as_map_of_strings() {
+	assert sample_data['obj']!.as_map() == {
+		'foo': json.Any(10)
+	}
+	assert sample_data['obj']!.as_map_of_strings() == {
+		'foo': '10'
+	}
+}
+
 fn test_arr() {
 	assert sample_data['int'] or { 0 }.arr()[0].int() == 1
 	assert sample_data['i64'] or { 0 }.arr()[0].i64() == 128.0