Fix logic bugs in benchmarks: correct cache miss counting and concurrent loop

Author: rodrigo.nogueira

benchmark.py

@@ -136,7 +136,8 @@ def test_cache_miss_benchmark(
     run_loop: Callable[..., Any],
     func: _LRUCacheWrapper[Any],
 ) -> None:
-    unique_objects = [object() for _ in range(128)]
+    # Use 2048 objects (16x maxsize=128) to force evictions and measure actual misses
+    unique_objects = [object() for _ in range(2048)]
     func.cache_clear()
 
     async def run() -> None:
@@ -222,7 +223,7 @@ def test_concurrent_cache_hit_benchmark(
     async def gather_coros():
         gather = asyncio.gather
         for _ in range(10):
-            return await gather(*map(func, keys))
+            await gather(*map(func, keys))
 
     benchmark(run_loop, gather_coros)