diff --git a/src/rust/op_cache.rs b/src/rust/op_cache.rs
index 0523975..67ca47c 100644
--- a/src/rust/op_cache.rs
+++ b/src/rust/op_cache.rs
@@ -1,11 +1,11 @@
-use std::collections::HashSet;
+use std::collections::HashMap;
 use napi_derive::napi;
 
-pub type OpTuple = (String, u32, String, u32);
+pub type OpTuple = (String, u32, String, u32); // buf_path, start, text, end
 
 #[napi]
 pub struct OpCache {
-	store: HashSet<OpTuple>,
+	store: HashMap<OpTuple, i32>
 }
 
 #[napi]
@@ -13,30 +13,53 @@ impl OpCache {
 	#[napi(constructor)]
 	pub fn new() -> Self {
 		OpCache {
-			store: HashSet::new(),
+			store: HashMap::new()
 		}
 	}
 
 	#[napi]
-	pub fn put(&mut self, buf: String, start: u32, text: String, end: u32) -> bool {
+	pub fn to_string(&self) -> String {
+		self.store.iter()
+			.map(|(k, v)| format!("{}x Op(@{} {}:{} '{}')", k.0, v, k.1, k.3, k.2))
+			.collect::<Vec<String>>()
+			.join(", ")
+	}
+
+	#[napi]
+	pub fn put(&mut self, buf: String, start: u32, text: String, end: u32) -> i32 {
 		let op = (buf, start, text, end);
-		let res = self.store.contains(&op);
-		self.store.insert(op);
-		res
+		match self.store.get_mut(&op) {
+			Some(val) => {
+				if *val < 0 { *val = 0 }
+				*val += 1;
+				*val
+			},
+			None => {
+				self.store.insert(op, 1);
+				return 1;
+			}
+		}
 	}
 
 	#[napi]
 	pub fn get(&mut self, buf: String, start: u32, text: String, end: u32) -> bool {
 		let op = (buf, start, text, end);
-		if self.store.contains(&op) {
-			self.store.remove(&op);
-			true
-		} else {
-			false
+		match self.store.get_mut(&op) {
+			Some(val) => {
+				*val -= 1;
+				*val >= 0
+			}
+			None => {
+				tracing::warn!("never seen this op: {:?}", op);
+				self.store.insert(op, -1);
+				false
+			},
 		}
 	}
 }
-
+//a
+//consume a
+//a 
 
 
 
@@ -44,28 +67,38 @@ impl OpCache {
 #[cfg(test)]
 mod test {
 	#[test]
-	fn op_cache_put_returns_whether_it_already_contained_the_key() {
+	fn opcache_put_increments_internal_counter() {
 		let mut op = super::OpCache::new();
-		assert!(!op.put("default".into(), 0, "hello world".into(), 0)); // false: did not already contain it
-		assert!(op.put("default".into(), 0, "hello world".into(), 0)); // true: already contained it
+		assert_eq!(op.put("default".into(), 0, "hello world".into(), 0), 1); // 1: did not already contain it
+		assert_eq!(op.put("default".into(), 0, "hello world".into(), 0), 2); // 2: already contained it
 	}
 	#[test]
-	fn op_cache_contains_only_after_put() {
+	fn op_cache_get_checks_count() {
 		let mut op = super::OpCache::new();
-		assert!(!op.get("default".into(), 0, "hello world".into(), 0));
-		op.put("default".into(), 0, "hello world".into(), 0);
-		assert!(op.get("default".into(), 0, "hello world".into(), 0));
+		assert_eq!(op.get("default".into(), 0, "hello world".into(), 0), false);
+		assert_eq!(op.put("default".into(), 0, "hello world".into(), 0), 1);
+		assert_eq!(op.get("default".into(), 0, "hello world".into(), 0), true);
+		assert_eq!(op.get("default".into(), 0, "hello world".into(), 0), false);
+	}
+	#[test]
+	fn op_cache_get_works_for_multiple_puts() {
+		let mut op = super::OpCache::new();
+		assert_eq!(op.get("default".into(), 0, "hello world".into(), 0), false);
+		assert_eq!(op.put("default".into(), 0, "hello world".into(), 0), 1);
+		assert_eq!(op.put("default".into(), 0, "hello world".into(), 0), 2);
+		assert_eq!(op.get("default".into(), 0, "hello world".into(), 0), true);
+		assert_eq!(op.get("default".into(), 0, "hello world".into(), 0), true);
+		assert_eq!(op.get("default".into(), 0, "hello world".into(), 0), false);
 	}
 
 	#[test]
 	fn op_cache_different_keys(){
 		let mut op = super::OpCache::new();
-		assert!(!op.get("default".into(), 0, "hello world".into(), 0));
-		op.put("default".into(), 0, "hello world".into(), 0);
-		assert!(op.get("default".into(), 0, "hello world".into(), 0));
-		assert!(!op.get("workspace".into(), 0, "hi".into(), 0));
-		op.put("workspace".into(), 0, "hi".into(), 0);
-		assert!(op.get("workspace".into(), 0, "hi".into(), 0));
+		assert_eq!(op.get("default".into(), 0, "hello world".into(), 0), false);
+		assert_eq!(op.put("default".into(), 0, "hello world".into(), 0), 1);
+		assert_eq!(op.get("workspace".into(), 0, "hi".into(), 0), false);
+		assert_eq!(op.put("workspace".into(), 0, "hi".into(), 0), 1);
+		assert_eq!(op.get("workspace".into(), 0, "hi".into(), 0), true);
+		assert_eq!(op.get("default".into(), 0, "hello world".into(), 0), true);
 	}
-
 }
\ No newline at end of file