fix the addition + deletion bug

Cargo.lock

@@ -359,6 +359,15 @@ dependencies = [
  "backtrace",
 ]
 
+[[package]]
+name = "arbitrary"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2d098ff73c1ca148721f37baad5ea6a465a13f9573aba8641fbbbae8164a54e"
+dependencies = [
+ "derive_arbitrary",
+]
+
 [[package]]
 name = "assert-json-diff"
 version = "2.0.2"
@@ -1096,6 +1105,17 @@ dependencies = [
  "syn 1.0.109",
 ]
 
+[[package]]
+name = "derive_arbitrary"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3cdeb9ec472d588e539a818b2dee436825730da08ad0017c4b1a17676bdc8b7"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "derive_builder"
 version = "0.12.0"
@@ -2711,6 +2731,7 @@ dependencies = [
 name = "milli"
 version = "1.2.0"
 dependencies = [
+ "arbitrary",
  "big_s",
  "bimap",
  "bincode",
@@ -2722,6 +2743,7 @@ dependencies = [
  "csv",
  "deserr",
  "either",
+ "fastrand",
  "filter-parser",
  "flatten-serde-json",
  "fst",