From 28544a954fc41724249436afdc7502d047683e5a Mon Sep 17 00:00:00 2001
From: Olivier Desenfans <desenfans.olivier@gmail.com>
Date: Mon, 17 Jun 2024 13:43:58 +0200
Subject: [PATCH 1/2] fix: revert breaking change on public input serialization

Problem: The 0x prefix was removed from public memory hex values in
fe72ee0e95cf9f1761cfdc0759af12a68294c081. This is incompatible with the
Stone prover and causes an exception.

Solution: revert the change.
---
 vm/src/air_public_input.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/vm/src/air_public_input.rs b/vm/src/air_public_input.rs
index a2e19f56b7..dc33457cb1 100644
--- a/vm/src/air_public_input.rs
+++ b/vm/src/air_public_input.rs
@@ -34,7 +34,7 @@ mod mem_value_serde {
         serializer: S,
     ) -> Result<S::Ok, S::Error> {
         if let Some(value) = value {
-            serializer.serialize_str(&format!("{:x}", value))
+            serializer.serialize_str(&format!("0x{:x}", value))
         } else {
             serializer.serialize_none()
         }
@@ -66,6 +66,7 @@ mod mem_value_serde {
         where
             E: de::Error,
         {
+            let value = value.strip_prefix("0x").unwrap_or(value);
             Felt252::from_hex(value)
                 .map_err(de::Error::custom)
                 .map(Some)

From fdf3fee0eab32db0e55aeaba63ee581a55c16c58 Mon Sep 17 00:00:00 2001
From: Olivier Desenfans <desenfans.olivier@gmail.com>
Date: Mon, 17 Jun 2024 13:47:46 +0200
Subject: [PATCH 2/2] changelog

---
 CHANGELOG.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index b0e1be6218..2e9ff54e72 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 #### Upcoming Changes
 
+* fix: revert breaking change on public input serialization [#1790](https://github.com/lambdaclass/cairo-vm/pull/1790)
+
 * fix: Handle `GasBuiltin` in cairo1-run crate [#1789](https://github.com/lambdaclass/cairo-vm/pull/1789)
   * Load `initial_gas` into vm instead of creating it via instructions.
   * Fix bug affecting programs with input arguments and gas builtin.