From 29350e6ec35c55514d1ceed0cbc0f7df5bf65e78 Mon Sep 17 00:00:00 2001
From: Ukendio <ukendio@gmail.com>
Date: Sun, 6 Jul 2025 17:07:40 +0200
Subject: [PATCH] Fix bug to allow deletion outside partitioned range

---
 jecs.luau       |  5 ++---
 test/tests.luau | 24 +++++++++++++++++++++++-
 2 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/jecs.luau b/jecs.luau
index 464b1df..f76d021 100755
--- a/jecs.luau
+++ b/jecs.luau
@@ -2174,7 +2174,7 @@ local function world_new()
 	local function inner_entity_index_try_get_any(entity: number): Record?
 		local r = eindex_sparse_array[ECS_ENTITY_T_LO(entity)]
 
-		if not r or r.dense == 0 then
+		if not r then
 			return nil
 		end
 
@@ -2589,7 +2589,7 @@ local function world_new()
 				return entity
 			else
 				for i = eindex_max_id + 1, index do
-					eindex_sparse_array[i]= { dense = i } :: Record
+					eindex_sparse_array[i] = { dense = i } :: Record
 					eindex_dense_array[i] = i
 				end
 				entity_index.max_id = index
@@ -2911,7 +2911,6 @@ local function world_new()
 
 		local e_swap = dense_array[i_swap]
 		local r_swap = inner_entity_index_try_get_any(e_swap :: number) :: Record
-
 		r_swap.dense = dense
 		record.archetype = nil :: any
 		record.row = nil :: any
diff --git a/test/tests.luau b/test/tests.luau
index 3f9ceb9..493aab5 100755
--- a/test/tests.luau
+++ b/test/tests.luau
@@ -659,7 +659,6 @@ TEST("world:delete()", function()
 		CHECK(not world:has(id1, Health))
 	end
 
-
 	do CASE "delete children"
 		local world = jecs.world()
 
@@ -846,6 +845,16 @@ TEST("world:delete()", function()
 		CHECK(not world:contains(bob))
 		CHECK(not world:contains(alice))
 	end
+
+	do CASE "deleted entity should not be able to be operated on"
+		local world = jecs.world()
+		local e = world:entity()
+		local A = world:component()
+		world:set(e, A, true)
+		world:delete(e)
+		world:set(e, A, true)
+		CHECK(world:has(e, A) == false)
+	end
 end)
 
 TEST("world:each()", function()
@@ -877,6 +886,19 @@ TEST("world:each()", function()
 end)
 
 TEST("world:range()", function()
+	do CASE "delete outside partitioned range"
+		local server = jecs.world()
+		local client = jecs.world()
+
+		server:range(0, 1000)
+		client:range(1000, 5000)
+
+		local e1 = server:entity()
+		CHECK((e1::number)< 1000)
+		local e2 = client:entity(e1)
+		CHECK(e2 == e1)
+		client:delete(e1)
+	end
 	do CASE "under range start"
 		local world = jecs.world()
 		world:range(400, 1000)