diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 4e36ed9..c66ad87 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -3,88 +3,88 @@ name: build
 on: [push, pull_request]
 
 jobs:
-#   build-linux-gcc:
-#     runs-on: Ubuntu-18.04
-#     strategy:
-#       matrix:
-#         # g++-4.8 and 4.9 are tested on Travis.CI.
-#         compiler: ['g++-9', 'g++-8', 'g++-7', 'g++-6', 'g++-5']
-#         standard: ['11', '14', '17', '20']
-#         exclude:
-#             - {compiler: 'g++-5', standard: '17'}
-#             - {compiler: 'g++-6', standard: '17'}
-#             - {compiler: 'g++-5', standard: '20'}
-#             - {compiler: 'g++-6', standard: '20'}
-#             - {compiler: 'g++-7', standard: '20'}
-#     steps:
-#       - name: Checkout
-#         uses: actions/checkout@v2
-#         with:
-#           submodules: true
-#       - name: Install
-#         run: |
-#             sudo apt-add-repository ppa:mhier/libboost-latest
-#             sudo apt-get update
-#             sudo apt-get install boost1.70
-#             if [[ "${{ matrix.compiler }}" == "g++-6" || "${{ matrix.compiler }}" == "g++-5" ]] ; then
-#                 sudo apt-add-repository ppa:ubuntu-toolchain-r/test
-#                 sudo apt-get update
-#                 sudo apt-get install ${{ matrix.compiler }}
-#             fi
-#       - name: Configure
-#         run: |
-#             mkdir build && cd build
-#             if [[ "${{ matrix.compiler }}" == "g++-8" && ( "${{ matrix.standard }}" == "17" || "${{ matrix.standard }}" == "20" ) ]] ; then
-#                 cmake .. -Dtoml11_BUILD_TEST=ON -DCMAKE_CXX_COMPILER=${{ matrix.compiler }} -DCMAKE_CXX_STANDARD=${{ matrix.standard }} -DTOML11_REQUIRE_FILESYSTEM_LIBRARY=ON
-#             else
-#                 cmake .. -Dtoml11_BUILD_TEST=ON -DCMAKE_CXX_COMPILER=${{ matrix.compiler }} -DCMAKE_CXX_STANDARD=${{ matrix.standard }}
-#             fi
-#       - name: Build
-#         run: |
-#             cd build && cmake --build .
-#       - name: Test
-#         run: |
-#             cd build && ctest --output-on-failure
-#   build-linux-clang:
-#     runs-on: Ubuntu-18.04
-#     strategy:
-#       matrix:
-#         compiler: ['10', '9', '8', '7', '6.0', '5.0', '4.0', '3.9']
-#         standard: ['11', '14', '17', '20']
-#         exclude:
-#             - {compiler: '3.9', standard: '17'}
-#             - {compiler: '4.0', standard: '17'}
-#             - {compiler: '5.0', standard: '17'}
-#             - {compiler: '3.9', standard: '20'}
-#             - {compiler: '4.0', standard: '20'}
-#             - {compiler: '5.0', standard: '20'}
-#             - {compiler: '6.0', standard: '20'}
-#             - {compiler: '7',   standard: '20'}
-#     steps:
-#       - name: Checkout
-#         uses: actions/checkout@v2
-#         with:
-#           submodules: true
-#       - name: Install
-#         run: |
-#             sudo apt-add-repository ppa:mhier/libboost-latest
-#             sudo apt-get update
-#             sudo apt-get install boost1.70
-#             if [[ "${{ matrix.compiler }}" != "6" && "${{ matrix.compiler }}" != "8" && "${{ matrix.compiler }}" != "9" ]] ; then
-#                 sudo apt-add-repository ppa:ubuntu-toolchain-r/test
-#                 sudo apt-get update
-#                 sudo apt-get install clang-${{ matrix.compiler }}
-#             fi
-#       - name: Configure
-#         run: |
-#             mkdir build && cd build
-#             cmake .. -Dtoml11_BUILD_TEST=ON -DCMAKE_C_COMPILER=clang-${{ matrix.compiler }} -DCMAKE_CXX_COMPILER=clang++-${{ matrix.compiler }} -DCMAKE_CXX_STANDARD=${{ matrix.standard }}
-#       - name: Build
-#         run: |
-#             cd build && cmake --build .
-#       - name: Test
-#         run: |
-#             cd build && ctest --output-on-failure
+  build-linux-gcc:
+    runs-on: Ubuntu-18.04
+    strategy:
+      matrix:
+        # g++-4.8 and 4.9 are tested on Travis.CI.
+        compiler: ['g++-9', 'g++-8', 'g++-7', 'g++-6', 'g++-5']
+        standard: ['11', '14', '17', '20']
+        exclude:
+            - {compiler: 'g++-5', standard: '17'}
+            - {compiler: 'g++-6', standard: '17'}
+            - {compiler: 'g++-5', standard: '20'}
+            - {compiler: 'g++-6', standard: '20'}
+            - {compiler: 'g++-7', standard: '20'}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          submodules: true
+      - name: Install
+        run: |
+            sudo apt-add-repository ppa:mhier/libboost-latest
+            sudo apt-get update
+            sudo apt-get install boost1.70
+            if [[ "${{ matrix.compiler }}" == "g++-6" || "${{ matrix.compiler }}" == "g++-5" ]] ; then
+                sudo apt-add-repository ppa:ubuntu-toolchain-r/test
+                sudo apt-get update
+                sudo apt-get install ${{ matrix.compiler }}
+            fi
+      - name: Configure
+        run: |
+            mkdir build && cd build
+            if [[ "${{ matrix.compiler }}" == "g++-8" && ( "${{ matrix.standard }}" == "17" || "${{ matrix.standard }}" == "20" ) ]] ; then
+                cmake .. -Dtoml11_BUILD_TEST=ON -DCMAKE_CXX_COMPILER=${{ matrix.compiler }} -DCMAKE_CXX_STANDARD=${{ matrix.standard }} -DTOML11_REQUIRE_FILESYSTEM_LIBRARY=ON
+            else
+                cmake .. -Dtoml11_BUILD_TEST=ON -DCMAKE_CXX_COMPILER=${{ matrix.compiler }} -DCMAKE_CXX_STANDARD=${{ matrix.standard }}
+            fi
+      - name: Build
+        run: |
+            cd build && cmake --build .
+      - name: Test
+        run: |
+            cd build && ctest --output-on-failure
+  build-linux-clang:
+    runs-on: Ubuntu-18.04
+    strategy:
+      matrix:
+        compiler: ['10', '9', '8', '7', '6.0', '5.0', '4.0', '3.9']
+        standard: ['11', '14', '17', '20']
+        exclude:
+            - {compiler: '3.9', standard: '17'}
+            - {compiler: '4.0', standard: '17'}
+            - {compiler: '5.0', standard: '17'}
+            - {compiler: '3.9', standard: '20'}
+            - {compiler: '4.0', standard: '20'}
+            - {compiler: '5.0', standard: '20'}
+            - {compiler: '6.0', standard: '20'}
+            - {compiler: '7',   standard: '20'}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          submodules: true
+      - name: Install
+        run: |
+            sudo apt-add-repository ppa:mhier/libboost-latest
+            sudo apt-get update
+            sudo apt-get install boost1.70
+            if [[ "${{ matrix.compiler }}" != "6" && "${{ matrix.compiler }}" != "8" && "${{ matrix.compiler }}" != "9" ]] ; then
+                sudo apt-add-repository ppa:ubuntu-toolchain-r/test
+                sudo apt-get update
+                sudo apt-get install clang-${{ matrix.compiler }}
+            fi
+      - name: Configure
+        run: |
+            mkdir build && cd build
+            cmake .. -Dtoml11_BUILD_TEST=ON -DCMAKE_C_COMPILER=clang-${{ matrix.compiler }} -DCMAKE_CXX_COMPILER=clang++-${{ matrix.compiler }} -DCMAKE_CXX_STANDARD=${{ matrix.standard }}
+      - name: Build
+        run: |
+            cd build && cmake --build .
+      - name: Test
+        run: |
+            cd build && ctest --output-on-failure
 
   build-osx:
     runs-on: macos-10.15
@@ -110,42 +110,42 @@ jobs:
         run: |
             cd build && ctest --output-on-failure
 
-#   build-windows-msvc:
-#     runs-on: windows-2019
-#     strategy:
-#       matrix:
-#         standard: ['11', '14', '17', '20']
-#         config: ['Release', 'Debug']
-#     steps:
-#       - name: Checkout
-#         uses: actions/checkout@v2
-#         with:
-#           submodules: true
-#       - name: Install
-#         run: |
-#             (New-Object System.Net.WebClient).DownloadFile("https://github.com/actions/boost-versions/releases/download/1.72.0-20200608.4/boost-1.72.0-win32-msvc14.2-x86_64.tar.gz", "$env:TEMP\\boost.tar.gz")
-#             7z.exe x "$env:TEMP\\boost.tar.gz" -o"$env:TEMP\\boostArchive" -y | Out-Null
-#             7z.exe x "$env:TEMP\\boostArchive" -o"$env:TEMP\\boost" -y | Out-Null
-#             Push-Location -Path "$env:TEMP\\boost"
-#             Invoke-Expression .\\setup.ps1
-#       - uses: ilammy/msvc-dev-cmd@v1
-#       - name: Configure
-#         shell: cmd
-#         run: |
-#             file --mime-encoding tests/test_literals.cpp
-#             mkdir build
-#             cd build
-#             cmake ../ -G "NMake Makefiles" -Dtoml11_BUILD_TEST=ON -DCMAKE_CXX_STANDARD=${{ matrix.standard }} -DBoost_NO_BOOST_CMAKE=ON -DBOOST_ROOT="C:\\hostedtoolcache\\windows\\Boost\\1.72.0\\x86_64"
-#       - name: Build
-#         working-directory: ./build
-#         run: |
-#             cmake --build . --config "${{ matrix.config }}"
-#       - name: Test
-#         working-directory: ./build
-#         run: |
-#             ./tests/test_literals --log_level=all
-#             file --mime-encoding tests/toml/tests/example.toml
-#             file --mime-encoding tests/toml/tests/fruit.toml
-#             file --mime-encoding tests/toml/tests/hard_example.toml
-#             file --mime-encoding tests/toml/tests/hard_example_unicode.toml
-#             ctest --build-config "${{ matrix.config }}" --output-on-failure
+  build-windows-msvc:
+    runs-on: windows-2019
+    strategy:
+      matrix:
+        standard: ['11', '14', '17', '20']
+        config: ['Release', 'Debug']
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          submodules: true
+      - name: Install
+        run: |
+            (New-Object System.Net.WebClient).DownloadFile("https://github.com/actions/boost-versions/releases/download/1.72.0-20200608.4/boost-1.72.0-win32-msvc14.2-x86_64.tar.gz", "$env:TEMP\\boost.tar.gz")
+            7z.exe x "$env:TEMP\\boost.tar.gz" -o"$env:TEMP\\boostArchive" -y | Out-Null
+            7z.exe x "$env:TEMP\\boostArchive" -o"$env:TEMP\\boost" -y | Out-Null
+            Push-Location -Path "$env:TEMP\\boost"
+            Invoke-Expression .\\setup.ps1
+      - uses: ilammy/msvc-dev-cmd@v1
+      - name: Configure
+        shell: cmd
+        run: |
+            file --mime-encoding tests/test_literals.cpp
+            mkdir build
+            cd build
+            cmake ../ -G "NMake Makefiles" -Dtoml11_BUILD_TEST=ON -DCMAKE_CXX_STANDARD=${{ matrix.standard }} -DBoost_NO_BOOST_CMAKE=ON -DBOOST_ROOT="C:\\hostedtoolcache\\windows\\Boost\\1.72.0\\x86_64"
+      - name: Build
+        working-directory: ./build
+        run: |
+            cmake --build . --config "${{ matrix.config }}"
+      - name: Test
+        working-directory: ./build
+        run: |
+            ./tests/test_literals --log_level=all
+            file --mime-encoding tests/toml/tests/example.toml
+            file --mime-encoding tests/toml/tests/fruit.toml
+            file --mime-encoding tests/toml/tests/hard_example.toml
+            file --mime-encoding tests/toml/tests/hard_example_unicode.toml
+            ctest --build-config "${{ matrix.config }}" --output-on-failure