Start: `UntypedMessageValue` for unsafe casting of `SerializedMessage`s

Fortune for rsh's current commit: Half blessing − 半吉

src/message.rs

@@ -1,7 +1,6 @@
 //! Messages
 use super::*;
 use std::marker::PhantomData;
-use serde::{Serialize, Deserialize};
 use cryptohelpers::{
     sha256,
     aes,

src/message/value.rs

@@ -1,5 +1,6 @@
 //! Message values
 use super::*;
+use serde::{Serialize, Deserialize};
 
 /// A value that can be used for messages.
 pub trait MessageValue: Serialize + for<'de> Deserialize<'de>{}
@@ -24,3 +25,9 @@ pub struct MessageValueAny(Box<dyn Any +'static>);
 //impl<T> MessageValue for DynamicMessageValue<T>
 //where T: Serialize + for<'de> Deserialize<'de> + Any{}
  */
+
+/// A type-unsafe `MessageValue` that can be used to transmute `SerializedMessage` instances.
+///
+/// This operation is unsafe and can result in deserializing the `SerializedMessage` failing, or even worse, a type confusion.
+#[derive(Debug, Serialize, Deserialize)]
+pub enum UntypedMessageValue{}