1 files changed, 26 insertions, 0 deletions
diff --git a/lib/containers/optional.go b/lib/containers/optional.go
index 3055308..c0e7b32 100644
--- a/lib/containers/optional.go
+++ b/lib/containers/optional.go
@@ -4,7 +4,33 @@
 
 package containers
 
+import (
+	"encoding/json"
+)
+
 type Optional[T any] struct {
 	OK  bool
 	Val T
 }
+
+var (
+	_ json.Marshaler   = Optional[bool]{}
+	_ json.Unmarshaler = (*Optional[bool])(nil)
+)
+
+func (o Optional[T]) MarshalJSON() ([]byte, error) {
+	if o.OK {
+		return json.Marshal(o.Val)
+	} else {
+		return []byte("null"), nil
+	}
+}
+
+func (o *Optional[T]) UnmarshalJSON(dat []byte) error {
+	if string(dat) == "null" {
+		*o = Optional[T]{}
+		return nil
+	}
+	o.OK = true
+	return json.Unmarshal(dat, &o.Val)
+}