json2: encode array (#17926)

vlib/x/json2/encode_struct_test.v

@@ -200,6 +200,10 @@ fn test_option_array() {
 		val: false
 	}]
 	assert json.encode(StructTypeOption[[]StructType[bool]]{ val: array_of_struct }) == '{"val":[{"val":true},{"val":false}]}'
+
+	// assert json.encode(StructTypeOption[[][]int]{
+	// 	val: [[0, 1], [0, 2, 3], [2], [5, 1]]
+	// }) == '{"val":[[0,1],[0,2,3],[2],[5,1]]}'
 }
 
 fn test_alias() {

vlib/x/json2/encoder_test.v

@@ -127,9 +127,9 @@ fn test_encode_array() {
 		val: [true, false]
 	}]
 
-	assert json.encode_array([1, 2, 3]) == '[1,2,3]'
+	assert json.encode([1, 2, 3]) == '[1,2,3]'
 
-	assert json.encode_array(array_of_struct) == '[{"val":[false,true]},{"val":[true,false]}]'
+	assert json.encode(array_of_struct) == '[{"val":[false,true]},{"val":[true,false]}]'
 }
 
 fn test_encode_simple() {

vlib/x/json2/json2.v

@@ -153,24 +153,25 @@ pub fn decode[T](src string) !T {
 // encode is a generic function that encodes a type into a JSON string.
 pub fn encode[T](val T) string {
 	$if T is $array {
-		$compile_error('Cannot use `json.encode` to encode array. Try `json.encode_array` instead')
-	}
-	mut sb := strings.new_builder(64)
+		return encode_array(val)
+	} $else {
+		mut sb := strings.new_builder(64)
 
-	defer {
-		unsafe { sb.free() }
-	}
+		defer {
+			unsafe { sb.free() }
+		}
 
-	default_encoder.encode_value(val, mut sb) or {
-		dump(err)
-		default_encoder.encode_value[Null](null, mut sb) or {}
-	}
+		default_encoder.encode_value(val, mut sb) or {
+			dump(err)
+			default_encoder.encode_value[Null](null, mut sb) or {}
+		}
 
-	return sb.str()
+		return sb.str()
+	}
 }
 
 // encode_array is a generic function that encodes a array into a JSON string.
-pub fn encode_array[T](val []T) string {
+fn encode_array[T](val []T) string {
 	mut sb := strings.new_builder(64)
 
 	defer {