fix diffing

Cargo.lock

@@ -734,6 +734,9 @@ dependencies = [
  "enumset",
  "euclid",
  "keyboard-types",
+ "serde",
+ "serde-value",
+ "serde_repr",
 ]
 
 [[package]]
@@ -840,6 +843,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b52c2ef4a78da0ba68fbe1fd920627411096d2ac478f7f4c9f3a54ba6705bade"
 dependencies = [
  "num-traits",
+ "serde",
 ]
 
 [[package]]
@@ -2387,6 +2391,17 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde_repr"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a5ec9fa74a20ebbe5d9ac23dac1fc96ba0ecfe9f50f2843b52e537b10fbcb4e"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "serde_urlencoded"
 version = "0.7.1"