UncheckedExtrinsic: Ensure that encoding leads to same bytes an ext was decoded from

prdoc/pr_10390.prdoc

@@ -0,0 +1,9 @@
+title: 'UncheckedExtrinsic: Ensure that encoding leads to same bytes an ext was decoded
+  from'
+doc:
+- audience: Runtime Dev
+  description: |-
+    This pull request ensures that when decoding an `UncheckedExtrinsic` from a certain byte string, it also encodes to the same byte string. This is achieved by keeping the original bytes used to decode the `call` around and then directly encode these.
+crates:
+- name: sp-runtime
+  bump: major

substrate/primitives/runtime/src/generic/mod.rs

@@ -34,7 +34,8 @@ pub use self::{
 	era::{Era, Phase},
 	header::Header,
 	unchecked_extrinsic::{
-		ExtensionVersion, Preamble, SignedPayload, UncheckedExtrinsic, EXTRINSIC_FORMAT_VERSION,
+		CallAndMaybeEncoded, ExtensionVersion, Preamble, SignedPayload, UncheckedExtrinsic,
+		EXTRINSIC_FORMAT_VERSION,
 	},
 };
 pub use unchecked_extrinsic::UncheckedSignaturePayload;