diff --git a/README.md b/README.md
index d616a5b8..e4ca3081 100644
--- a/README.md
+++ b/README.md
@@ -21,26 +21,26 @@ TBW
 ```
 main.cpp
 Number of threads: 16
-                boost::unordered_flat_map, single threaded:  7792 ms
-  boost::unordered_flat_map, single threaded, shared_mutex: 11724 ms
-   boost::unordered_flat_map, single threaded, rw_spinlock:  9313 ms
-                                     cfoa, single threaded: 12702 ms
-                 cfoa, tbb::spin_rw_mutex, single threaded: 12496 ms
-                  cfoa, std::shared_mutex, single threaded: 14289 ms
-                    foa::concurrent_table, single threaded: 12325 ms
-                 tbb::concurrent_hash_map, single threaded: 22007 ms
-       boost::unordered_flat_map, sharded_prehashed<mutex>:  6556 ms
-boost::unordered_flat_map, sharded_prehashed<shared_mutex>: 22826 ms
- boost::unordered_flat_map, sharded_prehashed<rw_spinlock>:  7874 ms
-    boost::unordered_flat_map, sharded isolated, prehashed:  6432 ms
-                                                      cfoa:  4576 ms
-                                  cfoa, tbb::spin_rw_mutex:  4655 ms
-                                   cfoa, std::shared_mutex:  4899 ms
-                                     foa::concurrent_table:  4568 ms
-                                  tbb::concurrent_hash_map:  7418 ms
-                   gtl::parallel_flat_hash_map<std::mutex>:  7761 ms
-            gtl::parallel_flat_hash_map<std::shared_mutex>: 17729 ms
-                  gtl::parallel_flat_hash_map<rw_spinlock>: 10102 ms
+                boost::unordered_flat_map, single threaded:  7770 ms
+  boost::unordered_flat_map, single threaded, shared_mutex: 11703 ms
+   boost::unordered_flat_map, single threaded, rw_spinlock:  9284 ms
+                                     cfoa, single threaded: 12680 ms
+                 cfoa, tbb::spin_rw_mutex, single threaded: 12470 ms
+                  cfoa, std::shared_mutex, single threaded: 14257 ms
+                    foa::concurrent_table, single threaded: 12315 ms
+                 tbb::concurrent_hash_map, single threaded: 21969 ms
+       boost::unordered_flat_map, sharded_prehashed<mutex>:  6619 ms
+boost::unordered_flat_map, sharded_prehashed<shared_mutex>: 15876 ms
+ boost::unordered_flat_map, sharded_prehashed<rw_spinlock>:  7103 ms
+    boost::unordered_flat_map, sharded isolated, prehashed:  6077 ms
+                                                      cfoa:  4383 ms
+                                  cfoa, tbb::spin_rw_mutex:  4934 ms
+                                   cfoa, std::shared_mutex:  4854 ms
+                                     foa::concurrent_table:  4765 ms
+                                  tbb::concurrent_hash_map:  7557 ms
+                   gtl::parallel_flat_hash_map<std::mutex>:  7867 ms
+            gtl::parallel_flat_hash_map<std::shared_mutex>: 15433 ms
+                  gtl::parallel_flat_hash_map<rw_spinlock>:  9948 ms
 ```
 <!--gcc-x64/main.cpp.txt-->
 
@@ -49,26 +49,26 @@ boost::unordered_flat_map, sharded_prehashed<shared_mutex>: 22826 ms
 ```
 main.cpp
 Number of threads: 16
-                boost::unordered_flat_map, single threaded:  9241 ms
-  boost::unordered_flat_map, single threaded, shared_mutex: 12857 ms
-   boost::unordered_flat_map, single threaded, rw_spinlock: 10253 ms
-                                     cfoa, single threaded: 12662 ms
-                 cfoa, tbb::spin_rw_mutex, single threaded: 12691 ms
-                  cfoa, std::shared_mutex, single threaded: 14526 ms
-                    foa::concurrent_table, single threaded: 12647 ms
-                 tbb::concurrent_hash_map, single threaded: 23287 ms
-       boost::unordered_flat_map, sharded_prehashed<mutex>:  6184 ms
-boost::unordered_flat_map, sharded_prehashed<shared_mutex>: 17724 ms
- boost::unordered_flat_map, sharded_prehashed<rw_spinlock>:  7087 ms
-    boost::unordered_flat_map, sharded isolated, prehashed:  6993 ms
-                                                      cfoa:  4548 ms
-                                  cfoa, tbb::spin_rw_mutex:  4976 ms
-                                   cfoa, std::shared_mutex:  5098 ms
-                                     foa::concurrent_table:  4812 ms
-                                  tbb::concurrent_hash_map:  7533 ms
-                   gtl::parallel_flat_hash_map<std::mutex>:  8016 ms
-            gtl::parallel_flat_hash_map<std::shared_mutex>: 22204 ms
-                  gtl::parallel_flat_hash_map<rw_spinlock>: 12188 ms
+                boost::unordered_flat_map, single threaded:  9533 ms
+  boost::unordered_flat_map, single threaded, shared_mutex: 13137 ms
+   boost::unordered_flat_map, single threaded, rw_spinlock: 10504 ms
+                                     cfoa, single threaded: 12909 ms
+                 cfoa, tbb::spin_rw_mutex, single threaded: 12983 ms
+                  cfoa, std::shared_mutex, single threaded: 14848 ms
+                    foa::concurrent_table, single threaded: 12947 ms
+                 tbb::concurrent_hash_map, single threaded: 23977 ms
+       boost::unordered_flat_map, sharded_prehashed<mutex>:  6204 ms
+boost::unordered_flat_map, sharded_prehashed<shared_mutex>: 13453 ms
+ boost::unordered_flat_map, sharded_prehashed<rw_spinlock>:  7383 ms
+    boost::unordered_flat_map, sharded isolated, prehashed:  6916 ms
+                                                      cfoa:  4707 ms
+                                  cfoa, tbb::spin_rw_mutex:  4781 ms
+                                   cfoa, std::shared_mutex:  5131 ms
+                                     foa::concurrent_table:  4908 ms
+                                  tbb::concurrent_hash_map:  7562 ms
+                   gtl::parallel_flat_hash_map<std::mutex>:  8099 ms
+            gtl::parallel_flat_hash_map<std::shared_mutex>: 18574 ms
+                  gtl::parallel_flat_hash_map<rw_spinlock>: 11900 ms
 ```
 <!--clang-x64/main.cpp.txt-->
 
@@ -77,26 +77,26 @@ boost::unordered_flat_map, sharded_prehashed<shared_mutex>: 17724 ms
 ```
 main.cpp
 Number of threads: 4
-                boost::unordered_flat_map, single threaded: 21162 ms
-  boost::unordered_flat_map, single threaded, shared_mutex: 25044 ms
-   boost::unordered_flat_map, single threaded, rw_spinlock: 23623 ms
-                                     cfoa, single threaded: 24545 ms
-                 cfoa, tbb::spin_rw_mutex, single threaded: 25643 ms
-                  cfoa, std::shared_mutex, single threaded: 25395 ms
-                    foa::concurrent_table, single threaded: 25180 ms
-                 tbb::concurrent_hash_map, single threaded: 43087 ms
-       boost::unordered_flat_map, sharded_prehashed<mutex>: 11143 ms
-boost::unordered_flat_map, sharded_prehashed<shared_mutex>:  9192 ms
- boost::unordered_flat_map, sharded_prehashed<rw_spinlock>:  9763 ms
-    boost::unordered_flat_map, sharded isolated, prehashed: 10487 ms
-                                                      cfoa:  8234 ms
-                                  cfoa, tbb::spin_rw_mutex:  8963 ms
-                                   cfoa, std::shared_mutex:  9408 ms
-                                     foa::concurrent_table:  8620 ms
-                                  tbb::concurrent_hash_map: 14492 ms
-                   gtl::parallel_flat_hash_map<std::mutex>: 11632 ms
-            gtl::parallel_flat_hash_map<std::shared_mutex>: 10297 ms
-                  gtl::parallel_flat_hash_map<rw_spinlock>: 12239 ms
+                boost::unordered_flat_map, single threaded: 23288 ms
+  boost::unordered_flat_map, single threaded, shared_mutex: 26618 ms
+   boost::unordered_flat_map, single threaded, rw_spinlock: 24765 ms
+                                     cfoa, single threaded: 24726 ms
+                 cfoa, tbb::spin_rw_mutex, single threaded: 25240 ms
+                  cfoa, std::shared_mutex, single threaded: 25126 ms
+                    foa::concurrent_table, single threaded: 24372 ms
+                 tbb::concurrent_hash_map, single threaded: 42235 ms
+       boost::unordered_flat_map, sharded_prehashed<mutex>: 10752 ms
+boost::unordered_flat_map, sharded_prehashed<shared_mutex>:  9122 ms
+ boost::unordered_flat_map, sharded_prehashed<rw_spinlock>:  9780 ms
+    boost::unordered_flat_map, sharded isolated, prehashed: 10422 ms
+                                                      cfoa:  8476 ms
+                                  cfoa, tbb::spin_rw_mutex:  8788 ms
+                                   cfoa, std::shared_mutex:  8894 ms
+                                     foa::concurrent_table:  9411 ms
+                                  tbb::concurrent_hash_map: 14647 ms
+                   gtl::parallel_flat_hash_map<std::mutex>: 13011 ms
+            gtl::parallel_flat_hash_map<std::shared_mutex>: 10819 ms
+                  gtl::parallel_flat_hash_map<rw_spinlock>: 12231 ms
 ```
 <!--vs-x64/main.cpp.txt-->
 
@@ -105,26 +105,26 @@ boost::unordered_flat_map, sharded_prehashed<shared_mutex>:  9192 ms
 ```
 main.cpp
 Number of threads: 8
-                boost::unordered_flat_map, single threaded:  5810 ms
-  boost::unordered_flat_map, single threaded, shared_mutex: 10264 ms
-   boost::unordered_flat_map, single threaded, rw_spinlock:  6061 ms
-                                     cfoa, single threaded:  7547 ms
+                boost::unordered_flat_map, single threaded:  6170 ms
+  boost::unordered_flat_map, single threaded, shared_mutex: 10145 ms
+   boost::unordered_flat_map, single threaded, rw_spinlock:  5972 ms
+                                     cfoa, single threaded:  7567 ms
                  cfoa, tbb::spin_rw_mutex, single threaded:  7573 ms
-                  cfoa, std::shared_mutex, single threaded: 11706 ms
-                    foa::concurrent_table, single threaded:  7434 ms
-                 tbb::concurrent_hash_map, single threaded: 17415 ms
-       boost::unordered_flat_map, sharded_prehashed<mutex>:  5165 ms
-boost::unordered_flat_map, sharded_prehashed<shared_mutex>: 11283 ms
- boost::unordered_flat_map, sharded_prehashed<rw_spinlock>:  3399 ms
+                  cfoa, std::shared_mutex, single threaded: 11623 ms
+                    foa::concurrent_table, single threaded:  7416 ms
+                 tbb::concurrent_hash_map, single threaded: 17459 ms
+       boost::unordered_flat_map, sharded_prehashed<mutex>:  5589 ms
+boost::unordered_flat_map, sharded_prehashed<shared_mutex>: 11327 ms
+ boost::unordered_flat_map, sharded_prehashed<rw_spinlock>:  3423 ms
     boost::unordered_flat_map, sharded isolated, prehashed:  4456 ms
-                                                      cfoa:  3666 ms
-                                  cfoa, tbb::spin_rw_mutex:  3893 ms
-                                   cfoa, std::shared_mutex:  4596 ms
-                                     foa::concurrent_table:  3712 ms
-                                  tbb::concurrent_hash_map:  5476 ms
-                   gtl::parallel_flat_hash_map<std::mutex>:  6391 ms
-            gtl::parallel_flat_hash_map<std::shared_mutex>: 11640 ms
-                  gtl::parallel_flat_hash_map<rw_spinlock>:  3749 ms
+                                                      cfoa:  3789 ms
+                                  cfoa, tbb::spin_rw_mutex:  3685 ms
+                                   cfoa, std::shared_mutex:  4611 ms
+                                     foa::concurrent_table:  3650 ms
+                                  tbb::concurrent_hash_map:  5350 ms
+                   gtl::parallel_flat_hash_map<std::mutex>:  6053 ms
+            gtl::parallel_flat_hash_map<std::shared_mutex>: 11545 ms
+                  gtl::parallel_flat_hash_map<rw_spinlock>:  3733 ms
 ```
 <!--clang-arm64/main.cpp.txt-->
 
@@ -133,26 +133,26 @@ boost::unordered_flat_map, sharded_prehashed<shared_mutex>: 11283 ms
 ```
 main.cpp
 Number of threads: 16
-                boost::unordered_flat_map, single threaded:  1054 ms
-  boost::unordered_flat_map, single threaded, shared_mutex:  1482 ms
-   boost::unordered_flat_map, single threaded, rw_spinlock:  1129 ms
-                                     cfoa, single threaded:  1488 ms
+                boost::unordered_flat_map, single threaded:  1079 ms
+  boost::unordered_flat_map, single threaded, shared_mutex:  1481 ms
+   boost::unordered_flat_map, single threaded, rw_spinlock:  1130 ms
+                                     cfoa, single threaded:  1498 ms
                  cfoa, tbb::spin_rw_mutex, single threaded:  1499 ms
-                  cfoa, std::shared_mutex, single threaded:  1778 ms
+                  cfoa, std::shared_mutex, single threaded:  1776 ms
                     foa::concurrent_table, single threaded:  1472 ms
-                 tbb::concurrent_hash_map, single threaded:  2223 ms
-       boost::unordered_flat_map, sharded_prehashed<mutex>:   788 ms
-boost::unordered_flat_map, sharded_prehashed<shared_mutex>:  1053 ms
- boost::unordered_flat_map, sharded_prehashed<rw_spinlock>:   792 ms
-    boost::unordered_flat_map, sharded isolated, prehashed:   782 ms
-                                                      cfoa:   680 ms
-                                  cfoa, tbb::spin_rw_mutex:   693 ms
-                                   cfoa, std::shared_mutex:   711 ms
-                                     foa::concurrent_table:   808 ms
-                                  tbb::concurrent_hash_map:   904 ms
-                   gtl::parallel_flat_hash_map<std::mutex>:  1098 ms
-            gtl::parallel_flat_hash_map<std::shared_mutex>:  1306 ms
-                  gtl::parallel_flat_hash_map<rw_spinlock>:   912 ms
+                 tbb::concurrent_hash_map, single threaded:  2225 ms
+       boost::unordered_flat_map, sharded_prehashed<mutex>:   764 ms
+boost::unordered_flat_map, sharded_prehashed<shared_mutex>:  1156 ms
+ boost::unordered_flat_map, sharded_prehashed<rw_spinlock>:   772 ms
+    boost::unordered_flat_map, sharded isolated, prehashed:   760 ms
+                                                      cfoa:   671 ms
+                                  cfoa, tbb::spin_rw_mutex:   694 ms
+                                   cfoa, std::shared_mutex:   762 ms
+                                     foa::concurrent_table:   755 ms
+                                  tbb::concurrent_hash_map:   863 ms
+                   gtl::parallel_flat_hash_map<std::mutex>:  1099 ms
+            gtl::parallel_flat_hash_map<std::shared_mutex>:  1776 ms
+                  gtl::parallel_flat_hash_map<rw_spinlock>:   982 ms
 ```
 <!--gcc-x86/main.cpp.txt-->
 
@@ -161,26 +161,26 @@ boost::unordered_flat_map, sharded_prehashed<shared_mutex>:  1053 ms
 ```
 main.cpp
 Number of threads: 16
-                boost::unordered_flat_map, single threaded:  1135 ms
+                boost::unordered_flat_map, single threaded:  1130 ms
   boost::unordered_flat_map, single threaded, shared_mutex:  1553 ms
-   boost::unordered_flat_map, single threaded, rw_spinlock:  1226 ms
-                                     cfoa, single threaded:  1440 ms
-                 cfoa, tbb::spin_rw_mutex, single threaded:  1455 ms
-                  cfoa, std::shared_mutex, single threaded:  1765 ms
-                    foa::concurrent_table, single threaded:  1463 ms
-                 tbb::concurrent_hash_map, single threaded:  2388 ms
-       boost::unordered_flat_map, sharded_prehashed<mutex>:   750 ms
-boost::unordered_flat_map, sharded_prehashed<shared_mutex>:  1432 ms
- boost::unordered_flat_map, sharded_prehashed<rw_spinlock>:   673 ms
-    boost::unordered_flat_map, sharded isolated, prehashed:   791 ms
-                                                      cfoa:   622 ms
-                                  cfoa, tbb::spin_rw_mutex:   646 ms
-                                   cfoa, std::shared_mutex:   708 ms
-                                     foa::concurrent_table:   882 ms
-                                  tbb::concurrent_hash_map:   887 ms
-                   gtl::parallel_flat_hash_map<std::mutex>:  1013 ms
-            gtl::parallel_flat_hash_map<std::shared_mutex>:  2014 ms
-                  gtl::parallel_flat_hash_map<rw_spinlock>:   909 ms
+   boost::unordered_flat_map, single threaded, rw_spinlock:  1223 ms
+                                     cfoa, single threaded:  1439 ms
+                 cfoa, tbb::spin_rw_mutex, single threaded:  1456 ms
+                  cfoa, std::shared_mutex, single threaded:  1763 ms
+                    foa::concurrent_table, single threaded:  1453 ms
+                 tbb::concurrent_hash_map, single threaded:  2391 ms
+       boost::unordered_flat_map, sharded_prehashed<mutex>:   766 ms
+boost::unordered_flat_map, sharded_prehashed<shared_mutex>:  2573 ms
+ boost::unordered_flat_map, sharded_prehashed<rw_spinlock>:   676 ms
+    boost::unordered_flat_map, sharded isolated, prehashed:   755 ms
+                                                      cfoa:   645 ms
+                                  cfoa, tbb::spin_rw_mutex:   640 ms
+                                   cfoa, std::shared_mutex:   732 ms
+                                     foa::concurrent_table:   832 ms
+                                  tbb::concurrent_hash_map:   877 ms
+                   gtl::parallel_flat_hash_map<std::mutex>:  1040 ms
+            gtl::parallel_flat_hash_map<std::shared_mutex>:  1387 ms
+                  gtl::parallel_flat_hash_map<rw_spinlock>:  1182 ms
 ```
 <!--clang-x86/main.cpp.txt-->
 
@@ -189,25 +189,25 @@ boost::unordered_flat_map, sharded_prehashed<shared_mutex>:  1432 ms
 ```
 main.cpp
 Number of threads: 4
-                boost::unordered_flat_map, single threaded:  1391 ms
-  boost::unordered_flat_map, single threaded, shared_mutex:  1748 ms
-   boost::unordered_flat_map, single threaded, rw_spinlock:  1520 ms
-                                     cfoa, single threaded:  2131 ms
-                 cfoa, tbb::spin_rw_mutex, single threaded:  2282 ms
-                  cfoa, std::shared_mutex, single threaded:  2334 ms
-                    foa::concurrent_table, single threaded:  2010 ms
-                 tbb::concurrent_hash_map, single threaded:  3947 ms
-       boost::unordered_flat_map, sharded_prehashed<mutex>:   995 ms
-boost::unordered_flat_map, sharded_prehashed<shared_mutex>:   694 ms
- boost::unordered_flat_map, sharded_prehashed<rw_spinlock>:   707 ms
-    boost::unordered_flat_map, sharded isolated, prehashed:   871 ms
-                                                      cfoa:   833 ms
-                                  cfoa, tbb::spin_rw_mutex:   856 ms
-                                   cfoa, std::shared_mutex:   838 ms
-                                     foa::concurrent_table:   914 ms
-                                  tbb::concurrent_hash_map:  1516 ms
-                   gtl::parallel_flat_hash_map<std::mutex>:  1081 ms
-            gtl::parallel_flat_hash_map<std::shared_mutex>:   941 ms
-                  gtl::parallel_flat_hash_map<rw_spinlock>:   807 ms
+                boost::unordered_flat_map, single threaded:  1349 ms
+  boost::unordered_flat_map, single threaded, shared_mutex:  1734 ms
+   boost::unordered_flat_map, single threaded, rw_spinlock:  1513 ms
+                                     cfoa, single threaded:  2042 ms
+                 cfoa, tbb::spin_rw_mutex, single threaded:  2099 ms
+                  cfoa, std::shared_mutex, single threaded:  2307 ms
+                    foa::concurrent_table, single threaded:  2070 ms
+                 tbb::concurrent_hash_map, single threaded:  4069 ms
+       boost::unordered_flat_map, sharded_prehashed<mutex>:  1100 ms
+boost::unordered_flat_map, sharded_prehashed<shared_mutex>:   869 ms
+ boost::unordered_flat_map, sharded_prehashed<rw_spinlock>:   677 ms
+    boost::unordered_flat_map, sharded isolated, prehashed:   939 ms
+                                                      cfoa:   782 ms
+                                  cfoa, tbb::spin_rw_mutex:   772 ms
+                                   cfoa, std::shared_mutex:   973 ms
+                                     foa::concurrent_table:   875 ms
+                                  tbb::concurrent_hash_map:  1438 ms
+                   gtl::parallel_flat_hash_map<std::mutex>:  1176 ms
+            gtl::parallel_flat_hash_map<std::shared_mutex>:   935 ms
+                  gtl::parallel_flat_hash_map<rw_spinlock>:   910 ms
 ```
 <!--vs-x86/main.cpp.txt-->