diff --git a/src/guf_id_pool.h b/src/guf_id_pool.h
index 633a1ed..2c672be 100644
--- a/src/guf_id_pool.h
+++ b/src/guf_id_pool.h
@@ -140,20 +140,20 @@ static bool GUF_CAT(GUF_ID_POOL_NAME, _is_valid)(const GUF_ID_POOL_NAME *pool)
 GUF_ID_POOL_NAME *GUF_CAT(GUF_ID_POOL_NAME, _try_init)(GUF_ID_POOL_NAME *pool, ptrdiff_t initial_cap, guf_allocator *allocator, guf_err *err)
 {
     if (!pool) {
-        guf_err_set_or_panic(err, GUF_ERR_NULL_PTR, "in guf_idpool_try_init: pool is NULL");
+        guf_err_set_or_panic(err, GUF_ERR_NULL_PTR, GUF_ERR_MSG("in guf_idpool_try_init: pool is NULL"));
         return NULL;
     } else if (!allocator || !allocator->alloc || !allocator->realloc || !allocator->free) {
-        guf_err_set_or_panic(err, GUF_ERR_NULL_PTR, "in guf_idpool_try_init: allocator is NULL");
+        guf_err_set_or_panic(err, GUF_ERR_NULL_PTR, GUF_ERR_MSG("in guf_idpool_try_init: allocator is NULL"));
         return NULL;
     } else if (initial_cap < 0) {
-        guf_err_set_or_panic(err, GUF_ERR_INVALID_ARG, "in guf_idpool_try_init: initial_cap is < 0");
+        guf_err_set_or_panic(err, GUF_ERR_INVALID_ARG, GUF_ERR_MSG("in guf_idpool_try_init: initial_cap is < 0"));
         return NULL;
     }
 
     pool->free_id_dbuf = {0};
     GUF_CAT(GUF_ID_POOL_DBUF, _try_init)(&pool->free_id_dbuf, initial_cap, allocator, err);
     if (err && *err != GUF_ERR_NONE) {
-        guf_err_set_or_panic(err, *err, "in guf_idpool_try_init: failed to allocate dbuf");
+        guf_err_set_or_panic(err, *err, GUF_ERR_MSG("in guf_idpool_try_init: failed to allocate dbuf"));
         return NULL;
     }
     
@@ -201,7 +201,7 @@ GUF_ID_POOL_T GUF_CAT(GUF_ID_POOL_NAME, _try_alloc_id)(GUF_ID_POOL_NAME *pool, g
         pool->next_id += 1;
     }
     if (id == GUF_ID_POOL_NULL) {
-        guf_err_set_or_panic(err, GUF_ERR_INT_OVERFLOW, "in guf_idpool_try_alloc_id: Out of ids.");
+        guf_err_set_or_panic(err, GUF_ERR_INT_OVERFLOW, GUF_ERR_MSG("in guf_idpool_try_alloc_id: Out of ids."));
     } else {
         guf_err_set_if_not_null(err, GUF_ERR_NONE);
     }
@@ -219,27 +219,29 @@ void GUF_CAT(GUF_ID_POOL_NAME, _try_free_id)(GUF_ID_POOL_NAME *pool, GUF_ID_POOL
     GUF_ASSERT(GUF_CAT(GUF_ID_POOL_NAME, _is_valid)(pool));
 
     if (id == GUF_ID_POOL_NULL) { // ID is NULL. 
-        guf_err_set_or_panic(err, GUF_ERR_IDX_RANGE, "in guf_idpool_try_free_id: id is NULL");
+        guf_err_set_or_panic(err, GUF_ERR_IDX_RANGE, GUF_ERR_MSG("in guf_idpool_try_free_id: id is NULL"));
         return;
     } else if (id < 0 || id >= pool->next_id) { // ID is beyond the allocated range.
-        guf_err_set_or_panic(err, GUF_ERR_IDX_RANGE, "in guf_idpool_try_free_id: id < 0 or id >= pool->next_id");
+        guf_err_set_or_panic(err, GUF_ERR_IDX_RANGE, GUF_ERR_MSG("in guf_idpool_try_free_id: id < 0 or id >= pool->next_id"));
         return;
     } else if (pool->next_id == 0) { // There haven't been any IDs allocated yet.
         GUF_ASSERT(pool->free_id_dbuf.size == 0);
-        guf_err_set_or_panic(err, GUF_ERR_IDX_RANGE, "in guf_idpool_try_free_id: pool->next_id == 0");
+        guf_err_set_or_panic(err, GUF_ERR_IDX_RANGE, GUF_ERR_MSG("in guf_idpool_try_free_id: pool->next_id == 0"));
         return;
     }
-
-    // NOTE: https://github.com/erincatto/box2d/issues/893 (last-retrieved 2025-03-17)
+    
+    /*
+    // NOTE: https://github.com/erincatto/box2d/issues/893 (last-retrieved 2025-04-09)
     if (id == pool->next_id - 1) { // Optimisation in case we remove the largest allocated id so far
         pool->next_id -= 1;
         guf_err_set_if_not_null(err, GUF_ERR_NONE);
         return;
     }
+    */
 
     GUF_CAT(GUF_ID_POOL_DBUF, _try_push_val)(&pool->free_id_dbuf, id, err);
     if (err && *err != GUF_ERR_NONE) {
-        guf_err_set_or_panic(err, *err, "in guf_idpool_try_free_id: failed to push id");
+        guf_err_set_or_panic(err, *err, GUF_ERR_MSG("in guf_idpool_try_free_id: failed to push id"));
     } else {
         guf_err_set_if_not_null(err, GUF_ERR_NONE);
     }