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Benchmarks vs google dens hash map and flat_hash_map

Could you add some benchmarks for the library

https://github.com/skarupke/flat_hash_map

Cannot compile under visual studio 2019 and clang

Hello, can you specify the compiler version and working environment.
I tried to compile it on visual studio 2019 and it showed:

\repos\dense_hash_map\include\jg\dense_hash_map.hpp(731): warning C4244:'argument': conversion from'float' to'unsigned __int64', possible loss of data
  ninja: build stopped: subcommand failed.

So I deleted /WXin
https://github.com/Jiwan/dense_hash_map/blob/master/tests/CMakeLists.txt#L13

When I compile it next, the system displays:

Expression: vector iterators incompatible
For information on how your program can cause an assertionfailure, see the Visual C++ documentation on asserts.

I tried it under wsl, ubuntu18.04, clang14 cmake 3.15.5 and encountered problems:

- Configuring done
CMake Warning (dev) at tests/CMakeLists.txt:8 (add_executable):
  Policy CMP0115 is not set: Source file extensions must be explicit. Run
  "cmake --help-policy CMP0115" for policy details. Use the cmake_policy
  command to set the policy and suppress this warning.
  File: /home/mingy/dense_hash_map/tests/src/dense_hash_map_tests.cpp
This warning is for project developers. Use -Wno-dev to suppress it.

Do you have any plans to write the fourth article, and will you improve the readme document?

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