diff --git a/src/guf_str.h b/src/guf_str.h
index ed431d4..cfe16db 100644
--- a/src/guf_str.h
+++ b/src/guf_str.h
@@ -585,8 +585,8 @@ GUF_STR_KWRDS guf_str *guf_str_try_append_char(guf_str *str, char c, ptrdiff_t t
         }
     }
     const size_t new_cap = guf_str_cap_internal_(str);
+    GUF_ASSERT_RELEASE(new_cap >= new_len && new_cap >= old_cap);
     GUF_ASSERT(guf_str_len_internal_(str) == old_len);
-    GUF_ASSERT(new_cap >= new_len && new_cap >= old_cap);
     GUF_ASSERT(((ptrdiff_t)new_cap - (ptrdiff_t)old_len) >= times);
 
     char *c_str = guf_str_get_cstr_internal_(str);
@@ -649,7 +649,7 @@ GUF_STR_KWRDS guf_str *guf_str_try_append(guf_str *str, guf_str_view sv, guf_err
     }
 
     const size_t new_cap = guf_str_cap_internal_(str);
-    GUF_ASSERT(new_cap >= old_cap && new_cap >= new_len);
+    GUF_ASSERT_RELEASE(new_cap >= old_cap && new_cap >= new_len);
     GUF_ASSERT(((ptrdiff_t)new_cap - (ptrdiff_t)old_len) >= sv.len);
 
     char *c_str_dst = guf_str_get_cstr_internal_(str);
@@ -804,7 +804,8 @@ GUF_STR_KWRDS guf_str_view guf_str_view_trim_left_ascii(guf_str_view sv)
         return sv;
     }
 
-    for (; sv.len > 0 && guf_char_isspace_ascii(*sv.str); --sv.len, ++sv.str);
+    for (; sv.len > 0 && guf_char_isspace_ascii(*sv.str); --sv.len, ++sv.str)
+    ;
 
     GUF_ASSERT(sv.len >= 0);
     GUF_ASSERT(sv.len == 0 || !guf_char_isspace_ascii(*sv.str));
@@ -818,7 +819,8 @@ GUF_STR_KWRDS guf_str_view guf_str_view_trim_right_ascii(guf_str_view sv)
         return sv;
     }
 
-    for (; sv.len > 0 && guf_char_isspace_ascii(sv.str[sv.len - 1]); --sv.len);
+    for (; sv.len > 0 && guf_char_isspace_ascii(sv.str[sv.len - 1]); --sv.len)
+    ;
 
     GUF_ASSERT(sv.len >= 0);
     GUF_ASSERT(sv.len == 0 || !guf_char_isspace_ascii(sv.str[sv.len - 1]));
diff --git a/src/test/example.c b/src/test/example.c
index 6cf386d..ec187d8 100644
--- a/src/test/example.c
+++ b/src/test/example.c
@@ -241,13 +241,13 @@ int main(void)
         guf_quaternion rotq = guf_quaternion_from_axis_angle(angle, guf_vec3_normalised((guf_vec3){-2324234.3f, 1.4f, -1.3f}));
         guf_mat4x4 rotmat, rotmat_inv;
         guf_mat4x4_init_from_quaternion(&rotmat, rotq);
-        GUF_ASSERT(guf_mat4x4_inverted(&rotmat, &rotmat_inv))
+        GUF_ASSERT_RELEASE(guf_mat4x4_inverted(&rotmat, &rotmat_inv))
 
         guf_mat4x4_set_trans(&rotmat, (guf_vec3){42.1234f, -512.2f, 3.1415926f});
-        GUF_ASSERT(guf_mat4x4_inverted(&rotmat, &rotmat_inv));
+        GUF_ASSERT_RELEASE(guf_mat4x4_inverted(&rotmat, &rotmat_inv));
 
-        GUF_ASSERT(guf_mat4x4_inverted(&rotmat_inv, &rotmat));
-        GUF_ASSERT(guf_mat4x4_inverted(&rotmat, &rotmat_inv));
+        GUF_ASSERT_RELEASE(guf_mat4x4_inverted(&rotmat_inv, &rotmat));
+        GUF_ASSERT_RELEASE(guf_mat4x4_inverted(&rotmat, &rotmat_inv));
     }
 
     guf_quaternion q = guf_quaternion_from_axis_angle(GUF_PI_F32 / 8.f, guf_vec3_normalised((guf_vec3){0.3f, 10.2f, -25.f}));
@@ -270,8 +270,8 @@ int main(void)
     } else {
         printf("Inverse:\n");
         guf_mat4x4_print_with_precision(&mat_inv, stdout, 8);
-        GUF_ASSERT(guf_mat4x4_inverted(&mat_inv, &mat));
-        GUF_ASSERT(guf_mat4x4_nearly_equal(&mat, &mat_cpy, 1e-4f, 1e-5f));
+        GUF_ASSERT_RELEASE(guf_mat4x4_inverted(&mat_inv, &mat));
+        GUF_ASSERT_RELEASE(guf_mat4x4_nearly_equal(&mat, &mat_cpy, 1e-4f, 1e-5f));
     }
 
     mat = (guf_mat4x4) {.data = {
diff --git a/todo.txt b/todo.txt
index 6b52f06..deba8e1 100644
--- a/todo.txt
+++ b/todo.txt
@@ -1,6 +1,6 @@
 - sort: add cpp #ifdef to remove restrict from declaration
 
-- tests for guf_dict with GUF_DICT_64_BIT_IDX (and also hash32/hash64)
+- tests for guf_dict with GUF_DICT_64_BIT_IDX (and also hash32/hash64); maybe pass kv_type to insert to avoid copy
 
 - guf_stack, guf_queue, guf_dqueue, guf_prio_queue (using a heap), guf_ringbuf