diff --git a/.github/workflows/CodeQL.yml b/.github/workflows/CodeQL.yml
index f90780d..0a7691e 100644
--- a/.github/workflows/CodeQL.yml
+++ b/.github/workflows/CodeQL.yml
@@ -1,5 +1,5 @@
-# ------------------------------------------------------------------------------
-#  Copyright Christopher Kormanyos 2022.
+# ------------------------------------------------------------------------------
+#  Copyright Christopher Kormanyos 2022 - 2024.
 #  Distributed under the Boost Software License,
 #  Version 1.0. (See accompanying file LICENSE_1_0.txt
 #  or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -23,9 +23,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        language: [ 'cpp' ]
+        language: [ python, cpp ]
+
     steps:
-      - uses: actions/checkout@v4
+      - name: Checkout
+        uses: actions/checkout@v4
+
       - name: clone-submods-bootstrap-headers-boost-develop
         run: |
           git clone -b develop --depth 1 https://github.com/boostorg/boost.git ../boost-root
@@ -35,16 +38,28 @@ jobs:
           git submodule update --init libs/multiprecision
           ./bootstrap.sh
           ./b2 headers
+
+      - name: Configure (cpp)
+        if: ${{ matrix.language == 'cpp' }}
+        run: echo configure_command_empty
+
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@v2
+        uses: github/codeql-action/init@v3
         with:
           languages: ${{ matrix.language }}
-      - uses: github/codeql-action/autobuild@v2
-      - name: gcc-native-for-codeql
+          queries: +security-and-quality
+
+      - name: Autobuild
+        uses: github/codeql-action/autobuild@v3
+        if: ${{ matrix.language == 'python' }}
+
+      - name: Build cpp
+        if: ${{ matrix.language == 'cpp' }}
         run: |
-          echo "build application on the command line"
-          g++ -fno-exceptions -fno-rtti -finline-functions -m64 -O3 -Werror -Wall -Wextra -Wconversion -Wsign-conversion -Wshadow -Wundef -Wunused-parameter -Wuninitialized -Wunreachable-code -Winit-self -Wzero-as-null-pointer-constant -std=c++14 -DWIDE_INTEGER_HAS_LIMB_TYPE_UINT64 -I. -I../boost-root -pthread -lpthread  test/test.cpp test/test_uintwide_t_boost_backend.cpp test/test_uintwide_t_edge_cases.cpp test/test_uintwide_t_examples.cpp test/test_uintwide_t_float_convert.cpp test/test_uintwide_t_int_convert.cpp test/test_uintwide_t_n_base.cpp test/test_uintwide_t_n_binary_ops_base.cpp test/test_uintwide_t_spot_values.cpp examples/example000_numeric_limits.cpp examples/example000a_builtin_convert.cpp examples/example001_mul_div.cpp examples/example001a_div_mod.cpp examples/example002_shl_shr.cpp examples/example003_sqrt.cpp examples/example003a_cbrt.cpp examples/example004_rootk_pow.cpp examples/example005_powm.cpp examples/example005a_pow_factors_of_p99.cpp examples/example006_gcd.cpp examples/example007_random_generator.cpp examples/example008_miller_rabin_prime.cpp examples/example008a_miller_rabin_prime.cpp examples/example009_timed_mul.cpp examples/example009a_timed_mul_4_by_4.cpp examples/example009b_timed_mul_8_by_8.cpp examples/example010_uint48_t.cpp examples/example011_uint24_t.cpp examples/example012_rsa_crypto.cpp examples/example013_ecdsa_sign_verify.cpp examples/example014_pi_spigot_wide.cpp -o wide_integer.exe
+          echo 'build application on the command line'
+          g++ -fno-exceptions -fno-rtti -finline-functions -m64 -O2 -Werror -Wall -Wextra -Wconversion -Wsign-conversion -Wshadow -Wundef -Wunused-parameter -Wuninitialized -Wunreachable-code -Winit-self -Wzero-as-null-pointer-constant -std=c++14 -DWIDE_INTEGER_HAS_LIMB_TYPE_UINT64 -I. -I../boost-root -pthread -lpthread  test/test.cpp test/test_uintwide_t_boost_backend.cpp test/test_uintwide_t_edge_cases.cpp test/test_uintwide_t_examples.cpp test/test_uintwide_t_float_convert.cpp test/test_uintwide_t_int_convert.cpp test/test_uintwide_t_n_base.cpp test/test_uintwide_t_n_binary_ops_base.cpp test/test_uintwide_t_spot_values.cpp examples/example000_numeric_limits.cpp examples/example000a_builtin_convert.cpp examples/example001_mul_div.cpp examples/example001a_div_mod.cpp examples/example002_shl_shr.cpp examples/example003_sqrt.cpp examples/example003a_cbrt.cpp examples/example004_rootk_pow.cpp examples/example005_powm.cpp examples/example005a_pow_factors_of_p99.cpp examples/example006_gcd.cpp examples/example007_random_generator.cpp examples/example008_miller_rabin_prime.cpp examples/example008a_miller_rabin_prime.cpp examples/example009_timed_mul.cpp examples/example009a_timed_mul_4_by_4.cpp examples/example009b_timed_mul_8_by_8.cpp examples/example010_uint48_t.cpp examples/example011_uint24_t.cpp examples/example012_rsa_crypto.cpp examples/example013_ecdsa_sign_verify.cpp examples/example014_pi_spigot_wide.cpp -o wide_integer.exe
+
       - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@v2
+        uses: github/codeql-action/analyze@v3
         with:
-          category: "/language:${{matrix.language}}"
+          category: "/language:${{ matrix.language }}"
diff --git a/.github/workflows/wide_integer.yml b/.github/workflows/wide_integer.yml
index 4d0ad43..c3a8261 100644
--- a/.github/workflows/wide_integer.yml
+++ b/.github/workflows/wide_integer.yml
@@ -567,33 +567,33 @@ jobs:
       fail-fast: false
       matrix:
         compiler: [ g++ ]
-        standard: [ c++17 ]
+        standard: [ c++17, c++20 ]
     steps:
       - uses: actions/checkout@v4
         with:
           fetch-depth: '0'
-      - name: Install Cygwin
-        run: choco install -y cygwin
-      - name: Install Package Manager
-        run: choco install -y cyg-get
-      - name: Install Packages
-        run: cyg-get git gcc-core gcc-g++
-      - name: boost-clone-develop
-        run: C:\\tools\\cygwin\\bin\\bash -l -c 'cd $(cygpath -u "$GITHUB_WORKSPACE") && git clone -b develop --depth 1 https://github.com/boostorg/boost.git ../boost-root'
-      - name: boost-update-tools
-        run: C:\\tools\\cygwin\\bin\\bash -l -c 'cd $(cygpath -u "$GITHUB_WORKSPACE")/../boost-root && git submodule update --init tools'
-      - name: boost-update-config
-        run: C:\\tools\\cygwin\\bin\\bash -l -c 'cd $(cygpath -u "$GITHUB_WORKSPACE")/../boost-root && git submodule update --init libs/config'
-      - name: boost-update-multiprecision
-        run: C:\\tools\\cygwin\\bin\\bash -l -c 'cd $(cygpath -u "$GITHUB_WORKSPACE")/../boost-root && git submodule update --init libs/multiprecision'
+      - name: clone-submods-boost-develop
+        run: |
+          git clone -b develop --depth 1 https://github.com/boostorg/boost.git ../boost-root
+          cd ../boost-root
+          git submodule update --init tools
+          git submodule update --init libs/config
+          git submodule update --init libs/multiprecision
+      - uses: cygwin/cygwin-install-action@master
+        with:
+          check-sig: false
+          site: https://ftp.fau.de/cygwin/
+          packages: gcc-core gcc-g++
       - name: boost-bootstrap
-        run: C:\\tools\\cygwin\\bin\\bash -l -c 'cd $(cygpath -u "$GITHUB_WORKSPACE")/../boost-root && ./bootstrap.sh'
+        run: bash -l -c 'cd $(cygpath -u "$GITHUB_WORKSPACE")/../boost-root && ./bootstrap.sh'
       - name: boost-generate-headers
-        run: C:\\tools\\cygwin\\bin\\bash -l -c 'cd $(cygpath -u "$GITHUB_WORKSPACE")/../boost-root && ./b2 headers'
+        run: bash -l -c 'cd $(cygpath -u "$GITHUB_WORKSPACE")/../boost-root && ./b2 headers'
+      - name: query-gcc-version
+        run: bash -l -c 'cd $(cygpath -u "$GITHUB_WORKSPACE") && echo print-compiler-version && ${{ matrix.compiler }} -v'
       - name: wide-integer-compile
-        run: C:\\tools\\cygwin\\bin\\bash -l -c 'cd $(cygpath -u "$GITHUB_WORKSPACE") && ${{ matrix.compiler }} -finline-functions -m64 -O3 -Wall -Wextra -Wpedantic -Wconversion -Wsign-conversion -Wshadow -Wundef -Wunused-parameter -Wuninitialized -Wunreachable-code -Winit-self -Wzero-as-null-pointer-constant -std=${{ matrix.standard }} -DWIDE_INTEGER_HAS_LIMB_TYPE_UINT64 -I. -I../boost-root -pthread -lpthread test/test.cpp test/test_uintwide_t_boost_backend.cpp test/test_uintwide_t_edge_cases.cpp test/test_uintwide_t_examples.cpp test/test_uintwide_t_float_convert.cpp test/test_uintwide_t_int_convert.cpp test/test_uintwide_t_n_base.cpp test/test_uintwide_t_n_binary_ops_base.cpp test/test_uintwide_t_spot_values.cpp examples/example000_numeric_limits.cpp examples/example000a_builtin_convert.cpp examples/example001_mul_div.cpp examples/example001a_div_mod.cpp examples/example002_shl_shr.cpp examples/example003_sqrt.cpp examples/example003a_cbrt.cpp examples/example004_rootk_pow.cpp examples/example005_powm.cpp examples/example005a_pow_factors_of_p99.cpp examples/example006_gcd.cpp examples/example007_random_generator.cpp examples/example008_miller_rabin_prime.cpp examples/example008a_miller_rabin_prime.cpp examples/example009_timed_mul.cpp examples/example009a_timed_mul_4_by_4.cpp examples/example009b_timed_mul_8_by_8.cpp examples/example010_uint48_t.cpp examples/example011_uint24_t.cpp examples/example012_rsa_crypto.cpp examples/example013_ecdsa_sign_verify.cpp examples/example014_pi_spigot_wide.cpp -o wide_integer.exe'
+        run: bash -l -c 'cd $(cygpath -u "$GITHUB_WORKSPACE") && ${{ matrix.compiler }} -finline-functions -m64 -O2 -Werror -Wall -Wextra -Wpedantic -Wconversion -Wsign-conversion -Wshadow -Wundef -Wunused-parameter -Wuninitialized -Wunreachable-code -Winit-self -Wzero-as-null-pointer-constant -std=${{ matrix.standard }} -DWIDE_INTEGER_HAS_LIMB_TYPE_UINT64 -I. -I../boost-root -pthread -lpthread test/test.cpp test/test_uintwide_t_boost_backend.cpp test/test_uintwide_t_edge_cases.cpp test/test_uintwide_t_examples.cpp test/test_uintwide_t_float_convert.cpp test/test_uintwide_t_int_convert.cpp test/test_uintwide_t_n_base.cpp test/test_uintwide_t_n_binary_ops_base.cpp test/test_uintwide_t_spot_values.cpp examples/example000_numeric_limits.cpp examples/example000a_builtin_convert.cpp examples/example001_mul_div.cpp examples/example001a_div_mod.cpp examples/example002_shl_shr.cpp examples/example003_sqrt.cpp examples/example003a_cbrt.cpp examples/example004_rootk_pow.cpp examples/example005_powm.cpp examples/example005a_pow_factors_of_p99.cpp examples/example006_gcd.cpp examples/example007_random_generator.cpp examples/example008_miller_rabin_prime.cpp examples/example008a_miller_rabin_prime.cpp examples/example009_timed_mul.cpp examples/example009a_timed_mul_4_by_4.cpp examples/example009b_timed_mul_8_by_8.cpp examples/example010_uint48_t.cpp examples/example011_uint24_t.cpp examples/example012_rsa_crypto.cpp examples/example013_ecdsa_sign_verify.cpp examples/example014_pi_spigot_wide.cpp -o wide_integer.exe'
       - name: wide-integer-run
-        run: C:\\tools\\cygwin\\bin\\bash -l -c 'cd $(cygpath -u "$GITHUB_WORKSPACE") && ./wide_integer.exe'
+        run: bash -l -c 'cd $(cygpath -u "$GITHUB_WORKSPACE") && ./wide_integer.exe'
   gcc-arm-none-eabi:
     runs-on: ubuntu-latest
     defaults:
@@ -618,7 +618,7 @@ jobs:
           tar -xzf xpack-qemu-arm-7.1.0-1-linux-x64.tar.gz
         working-directory: ./
       - id: upcase_my_example
-        uses: ASzc/change-string-case-action@v5
+        uses: ASzc/change-string-case-action@v6
         with:
           string: ${{ matrix.example }}
       - name: build-example-stm32f429
@@ -660,7 +660,7 @@ jobs:
           git clone -b master --depth 1 https://github.com/ckormanyos/real-time-cpp.git ../real-time-cpp-root
         working-directory: ./
       - id: upcase_my_example
-        uses: ASzc/change-string-case-action@v5
+        uses: ASzc/change-string-case-action@v6
         with:
           string: ${{ matrix.example }}
       - name: gcc-avr