diff --git a/third_party/double-conversion/.github/workflows/cmake.yml b/third_party/double-conversion/.github/workflows/cmake.yml
deleted file mode 100644
index 8ec26cf27..000000000
--- a/third_party/double-conversion/.github/workflows/cmake.yml
+++ /dev/null
@@ -1,34 +0,0 @@
-name: CMake
-
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
-
-env:
-  # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
-  BUILD_TYPE: Debug
-
-jobs:
-  build:
-    # The CMake configure and build commands are platform agnostic and should work equally well on Windows or Mac.
-    # You can convert this to a matrix build if you need cross-platform coverage.
-    # See: https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v2
-
-    - name: Configure CMake
-      # Configure CMake in a 'build' subdirectory.
-      run: cmake -B ${{github.workspace}}/build -DBUILD_TESTING=ON
-
-    - name: Build
-      # Build your program with the given configuration
-      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}}
-
-    - name: Test
-      working-directory: ${{github.workspace}}/build
-      # Execute all tests.  
-      run: test/cctest/cctest
diff --git a/third_party/double-conversion/BUILD b/third_party/double-conversion/BUILD
deleted file mode 100644
index 8c2eee564..000000000
--- a/third_party/double-conversion/BUILD
+++ /dev/null
@@ -1,78 +0,0 @@
-# Bazel(http://bazel.io) BUILD file
-
-load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test")
-
-licenses(["notice"])
-
-exports_files(["LICENSE"])
-
-cc_library(
-    name = "double-conversion",
-    srcs = [
-        "double-conversion/bignum.cc",
-        "double-conversion/bignum-dtoa.cc",
-        "double-conversion/cached-powers.cc",
-        "double-conversion/double-to-string.cc",
-        "double-conversion/fast-dtoa.cc",
-        "double-conversion/fixed-dtoa.cc",
-        "double-conversion/string-to-double.cc",
-        "double-conversion/strtod.cc",
-    ],
-    hdrs = [
-        "double-conversion/bignum.h",
-        "double-conversion/bignum-dtoa.h",
-        "double-conversion/cached-powers.h",
-        "double-conversion/diy-fp.h",
-        "double-conversion/double-conversion.h",
-        "double-conversion/double-to-string.h",
-        "double-conversion/fast-dtoa.h",
-        "double-conversion/fixed-dtoa.h",
-        "double-conversion/ieee.h",
-        "double-conversion/string-to-double.h",
-        "double-conversion/strtod.h",
-        "double-conversion/utils.h",
-    ],
-    linkopts = [
-        "-lm",
-    ],
-    visibility = ["//visibility:public"],
-)
-
-cc_test(
-    name = "cctest",
-    srcs = [
-        "test/cctest/cctest.cc",
-        "test/cctest/cctest.h",
-        "test/cctest/checks.h",
-        "test/cctest/gay-fixed.cc",
-        "test/cctest/gay-fixed.h",
-        "test/cctest/gay-precision.cc",
-        "test/cctest/gay-precision.h",
-        "test/cctest/gay-shortest.cc",
-        "test/cctest/gay-shortest.h",
-        "test/cctest/gay-shortest-single.cc",
-        "test/cctest/gay-shortest-single.h",
-        "test/cctest/test-bignum.cc",
-        "test/cctest/test-bignum-dtoa.cc",
-        "test/cctest/test-conversions.cc",
-        "test/cctest/test-diy-fp.cc",
-        "test/cctest/test-dtoa.cc",
-        "test/cctest/test-fast-dtoa.cc",
-        "test/cctest/test-fixed-dtoa.cc",
-        "test/cctest/test-ieee.cc",
-        "test/cctest/test-strtod.cc",
-    ],
-    args = [
-        "test-bignum",
-        "test-bignum-dtoa",
-        "test-conversions",
-        "test-diy-fp",
-        "test-dtoa",
-        "test-fast-dtoa",
-        "test-fixed-dtoa",
-        "test-ieee",
-        "test-strtod",
-    ],
-    visibility = ["//visibility:public"],
-    deps = [":double-conversion"],
-)
diff --git a/third_party/double-conversion/CMakeLists.txt b/third_party/double-conversion/CMakeLists.txt
deleted file mode 100644
index e13bcdd27..000000000
--- a/third_party/double-conversion/CMakeLists.txt
+++ /dev/null
@@ -1,118 +0,0 @@
-cmake_minimum_required(VERSION 3.0)
-project(double-conversion VERSION 3.2.0)
-
-if(BUILD_SHARED_LIBS AND MSVC)
-  set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
-endif()
-
-set(headers
-    double-conversion/bignum.h
-    double-conversion/cached-powers.h
-    double-conversion/diy-fp.h
-    double-conversion/double-conversion.h
-    double-conversion/double-to-string.h
-    double-conversion/fast-dtoa.h
-    double-conversion/fixed-dtoa.h
-    double-conversion/ieee.h
-    double-conversion/string-to-double.h
-    double-conversion/strtod.h
-    double-conversion/utils.h)
-
-add_library(double-conversion
-            double-conversion/bignum.cc
-            double-conversion/bignum-dtoa.cc
-            double-conversion/cached-powers.cc
-            double-conversion/double-to-string.cc
-            double-conversion/fast-dtoa.cc
-            double-conversion/fixed-dtoa.cc
-            double-conversion/string-to-double.cc
-            double-conversion/strtod.cc
-            ${headers})
-target_include_directories(
-    double-conversion PUBLIC
-    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>)
-
-# pick a version #
-set_target_properties(double-conversion PROPERTIES VERSION ${PROJECT_VERSION} SOVERSION 3)
-
-# set up testing if requested
-option(BUILD_TESTING "Build test programs" OFF)
-if(BUILD_TESTING)
-  enable_testing()
-  include(CTest)
-  add_subdirectory(test)
-endif()
-
-####
-# Installation (https://github.com/forexample/package-example)
-
-include(GNUInstallDirs)
-
-# Layout. This works for all platforms:
-#   * <prefix>/lib/cmake/<PROJECT-NAME>
-#   * <prefix>/lib/
-#   * <prefix>/include/
-set(config_install_dir "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}")
-
-set(generated_dir "${CMAKE_CURRENT_BINARY_DIR}/generated")
-
-# Configuration
-set(version_config "${generated_dir}/${PROJECT_NAME}ConfigVersion.cmake")
-set(project_config "${generated_dir}/${PROJECT_NAME}Config.cmake")
-set(targets_export_name "${PROJECT_NAME}Targets")
-set(namespace "${PROJECT_NAME}::")
-
-# Include module with function 'write_basic_package_version_file'
-include(CMakePackageConfigHelpers)
-
-# Configure '<PROJECT-NAME>ConfigVersion.cmake'
-# Note: PROJECT_VERSION is used as a VERSION
-write_basic_package_version_file(
-    "${version_config}" COMPATIBILITY SameMajorVersion
-)
-
-# Configure '<PROJECT-NAME>Config.cmake'
-# Use variables:
-#   * targets_export_name
-#   * PROJECT_NAME
-configure_package_config_file(
-    "cmake/Config.cmake.in"
-    "${project_config}"
-    INSTALL_DESTINATION "${config_install_dir}"
-)
-
-# Targets:
-#   * <prefix>/lib/libdouble-conversion.a
-#   * header location after install: <prefix>/include/double-conversion/*.h
-#   * headers can be included by C++ code `#include <double-conversion/*.h>`
-install(
-    TARGETS double-conversion
-    EXPORT "${targets_export_name}"
-    LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
-    ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
-    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
-    INCLUDES DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
-)
-
-# Headers:
-#   * double-conversion/*.h -> <prefix>/include/double-conversion/*.h
-install(
-    FILES ${headers}
-    DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/double-conversion"
-)
-
-# Config
-#   * <prefix>/lib/cmake/double-conversion/double-conversionConfig.cmake
-#   * <prefix>/lib/cmake/double-conversion/double-conversionConfigVersion.cmake
-install(
-    FILES "${project_config}" "${version_config}"
-    DESTINATION "${config_install_dir}"
-)
-
-# Config
-#   * <prefix>/lib/cmake/double-conversion/double-conversionTargets.cmake
-install(
-    EXPORT "${targets_export_name}"
-    NAMESPACE "${namespace}"
-    DESTINATION "${config_install_dir}"
-)
diff --git a/third_party/double-conversion/SConstruct b/third_party/double-conversion/SConstruct
deleted file mode 100644
index cebd7e0a2..000000000
--- a/third_party/double-conversion/SConstruct
+++ /dev/null
@@ -1,46 +0,0 @@
-# vim:ft=python
-import os
-
-double_conversion_sources = ['double-conversion/' + x for x in SConscript('double-conversion/SConscript')]
-double_conversion_test_sources = ['test/cctest/' + x for x in SConscript('test/cctest/SConscript')]
-
-DESTDIR = ARGUMENTS.get('DESTDIR', '')
-prefix = ARGUMENTS.get('prefix', '/usr/local')
-lib = ARGUMENTS.get('libsuffix', 'lib')
-libdir = os.path.join(DESTDIR + prefix, lib)
-
-env = Environment(CPPPATH='#', LIBS=['m', 'stdc++'],
-    CXXFLAGS=ARGUMENTS.get('CXXFLAGS', ''))
-debug = ARGUMENTS.get('debug', 0)
-optimize = ARGUMENTS.get('optimize', 0)
-env.Replace(CXX = ARGUMENTS.get('CXX', 'g++'))
-
-# for shared lib, requires scons 2.3.0
-env['SHLIBVERSION'] = '3.0.0'
-
-CCFLAGS = []
-if int(debug):
-  CCFLAGS.append(ARGUMENTS.get('CXXFLAGS', '-g -Wall -Wshadow -Werror -UNDEBUG'))
-if int(optimize):
-  CCFLAGS.append(ARGUMENTS.get('CXXFLAGS', '-O3 -DNDEBUG=1'))
-
-env.Append(CCFLAGS = " ".join(CCFLAGS))
-
-double_conversion_shared_objects = [
-    env.SharedObject(src) for src in double_conversion_sources]
-double_conversion_static_objects = [
-    env.StaticObject(src) for src in double_conversion_sources]
-
-library_name = 'double-conversion'
-
-static_lib = env.StaticLibrary(library_name, double_conversion_static_objects)
-static_lib_pic = env.StaticLibrary(library_name + '_pic', double_conversion_shared_objects)
-shared_lib = env.SharedLibrary(library_name, double_conversion_shared_objects)
-
-env.Program('run_tests', double_conversion_test_sources, LIBS=[static_lib])
-
-env.InstallVersionedLib(libdir, shared_lib)
-env.Install(libdir, static_lib)
-env.Install(libdir, static_lib_pic)
-
-env.Alias('install', libdir)
diff --git a/third_party/double-conversion/WORKSPACE b/third_party/double-conversion/WORKSPACE
deleted file mode 100644
index 52106e759..000000000
--- a/third_party/double-conversion/WORKSPACE
+++ /dev/null
@@ -1 +0,0 @@
-# Bazel (http://bazel.io/) WORKSPACE file for double-conversion.
diff --git a/third_party/double-conversion/double-conversion/bignum-dtoa.cc b/third_party/double-conversion/bignum-dtoa.cc
similarity index 100%
rename from third_party/double-conversion/double-conversion/bignum-dtoa.cc
rename to third_party/double-conversion/bignum-dtoa.cc
diff --git a/third_party/double-conversion/double-conversion/bignum-dtoa.h b/third_party/double-conversion/bignum-dtoa.h
similarity index 100%
rename from third_party/double-conversion/double-conversion/bignum-dtoa.h
rename to third_party/double-conversion/bignum-dtoa.h
diff --git a/third_party/double-conversion/double-conversion/bignum.cc b/third_party/double-conversion/bignum.cc
similarity index 100%
rename from third_party/double-conversion/double-conversion/bignum.cc
rename to third_party/double-conversion/bignum.cc
diff --git a/third_party/double-conversion/double-conversion/bignum.h b/third_party/double-conversion/bignum.h
similarity index 100%
rename from third_party/double-conversion/double-conversion/bignum.h
rename to third_party/double-conversion/bignum.h
diff --git a/third_party/double-conversion/double-conversion/cached-powers.cc b/third_party/double-conversion/cached-powers.cc
similarity index 100%
rename from third_party/double-conversion/double-conversion/cached-powers.cc
rename to third_party/double-conversion/cached-powers.cc
diff --git a/third_party/double-conversion/double-conversion/cached-powers.h b/third_party/double-conversion/cached-powers.h
similarity index 100%
rename from third_party/double-conversion/double-conversion/cached-powers.h
rename to third_party/double-conversion/cached-powers.h
diff --git a/third_party/double-conversion/cmake/Config.cmake.in b/third_party/double-conversion/cmake/Config.cmake.in
deleted file mode 100644
index 9b4c9ee03..000000000
--- a/third_party/double-conversion/cmake/Config.cmake.in
+++ /dev/null
@@ -1,4 +0,0 @@
-@PACKAGE_INIT@
-
-include("${CMAKE_CURRENT_LIST_DIR}/@targets_export_name@.cmake")
-check_required_components("@PROJECT_NAME@")
diff --git a/third_party/double-conversion/double-conversion/diy-fp.h b/third_party/double-conversion/diy-fp.h
similarity index 100%
rename from third_party/double-conversion/double-conversion/diy-fp.h
rename to third_party/double-conversion/diy-fp.h
diff --git a/third_party/double-conversion/double-conversion/double-conversion.h b/third_party/double-conversion/double-conversion.h
similarity index 100%
rename from third_party/double-conversion/double-conversion/double-conversion.h
rename to third_party/double-conversion/double-conversion.h
diff --git a/third_party/double-conversion/double-conversion/.gitignore b/third_party/double-conversion/double-conversion/.gitignore
deleted file mode 100644
index 1edeb79fd..000000000
--- a/third_party/double-conversion/double-conversion/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-*.os
diff --git a/third_party/double-conversion/double-conversion/SConscript b/third_party/double-conversion/double-conversion/SConscript
deleted file mode 100644
index d7ae3d78e..000000000
--- a/third_party/double-conversion/double-conversion/SConscript
+++ /dev/null
@@ -1,12 +0,0 @@
-# -*- coding: utf-8 -*-
-double_conversion_sources = [
-    'bignum.cc',
-    'bignum-dtoa.cc',
-    'cached-powers.cc',
-    'double-to-string.cc',
-    'fast-dtoa.cc',
-    'fixed-dtoa.cc',
-    'string-to-double.cc',
-    'strtod.cc'
-  ]
-Return('double_conversion_sources')
diff --git a/third_party/double-conversion/double-conversion/double-to-string.cc b/third_party/double-conversion/double-to-string.cc
similarity index 100%
rename from third_party/double-conversion/double-conversion/double-to-string.cc
rename to third_party/double-conversion/double-to-string.cc
diff --git a/third_party/double-conversion/double-conversion/double-to-string.h b/third_party/double-conversion/double-to-string.h
similarity index 100%
rename from third_party/double-conversion/double-conversion/double-to-string.h
rename to third_party/double-conversion/double-to-string.h
diff --git a/third_party/double-conversion/double-conversion/fast-dtoa.cc b/third_party/double-conversion/fast-dtoa.cc
similarity index 100%
rename from third_party/double-conversion/double-conversion/fast-dtoa.cc
rename to third_party/double-conversion/fast-dtoa.cc
diff --git a/third_party/double-conversion/double-conversion/fast-dtoa.h b/third_party/double-conversion/fast-dtoa.h
similarity index 100%
rename from third_party/double-conversion/double-conversion/fast-dtoa.h
rename to third_party/double-conversion/fast-dtoa.h
diff --git a/third_party/double-conversion/double-conversion/fixed-dtoa.cc b/third_party/double-conversion/fixed-dtoa.cc
similarity index 100%
rename from third_party/double-conversion/double-conversion/fixed-dtoa.cc
rename to third_party/double-conversion/fixed-dtoa.cc
diff --git a/third_party/double-conversion/double-conversion/fixed-dtoa.h b/third_party/double-conversion/fixed-dtoa.h
similarity index 100%
rename from third_party/double-conversion/double-conversion/fixed-dtoa.h
rename to third_party/double-conversion/fixed-dtoa.h
diff --git a/third_party/double-conversion/double-conversion/ieee.h b/third_party/double-conversion/ieee.h
similarity index 100%
rename from third_party/double-conversion/double-conversion/ieee.h
rename to third_party/double-conversion/ieee.h
diff --git a/third_party/double-conversion/msvc/double-conversion.sln b/third_party/double-conversion/msvc/double-conversion.sln
deleted file mode 100644
index 992c6bad3..000000000
--- a/third_party/double-conversion/msvc/double-conversion.sln
+++ /dev/null
@@ -1,38 +0,0 @@
-
-Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 2013
-VisualStudioVersion = 12.0.30723.0
-MinimumVisualStudioVersion = 10.0.40219.1
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "double-conversion", "double-conversion.vcxproj", "{6863544A-0CE8-4CA9-A132-74116FD9D9BB}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "run_tests", "run_tests\run_tests.vcxproj", "{5619CA2B-6D39-4984-BE37-7580BBBD2139}"
-EndProject
-Global
-	GlobalSection(SolutionConfigurationPlatforms) = preSolution
-		Debug|Win32 = Debug|Win32
-		Debug|x64 = Debug|x64
-		Release|Win32 = Release|Win32
-		Release|x64 = Release|x64
-	EndGlobalSection
-	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{6863544A-0CE8-4CA9-A132-74116FD9D9BB}.Debug|Win32.ActiveCfg = Debug|Win32
-		{6863544A-0CE8-4CA9-A132-74116FD9D9BB}.Debug|Win32.Build.0 = Debug|Win32
-		{6863544A-0CE8-4CA9-A132-74116FD9D9BB}.Debug|x64.ActiveCfg = Debug|x64
-		{6863544A-0CE8-4CA9-A132-74116FD9D9BB}.Debug|x64.Build.0 = Debug|x64
-		{6863544A-0CE8-4CA9-A132-74116FD9D9BB}.Release|Win32.ActiveCfg = Release|Win32
-		{6863544A-0CE8-4CA9-A132-74116FD9D9BB}.Release|Win32.Build.0 = Release|Win32
-		{6863544A-0CE8-4CA9-A132-74116FD9D9BB}.Release|x64.ActiveCfg = Release|x64
-		{6863544A-0CE8-4CA9-A132-74116FD9D9BB}.Release|x64.Build.0 = Release|x64
-		{5619CA2B-6D39-4984-BE37-7580BBBD2139}.Debug|Win32.ActiveCfg = Debug|Win32
-		{5619CA2B-6D39-4984-BE37-7580BBBD2139}.Debug|Win32.Build.0 = Debug|Win32
-		{5619CA2B-6D39-4984-BE37-7580BBBD2139}.Debug|x64.ActiveCfg = Debug|x64
-		{5619CA2B-6D39-4984-BE37-7580BBBD2139}.Debug|x64.Build.0 = Debug|x64
-		{5619CA2B-6D39-4984-BE37-7580BBBD2139}.Release|Win32.ActiveCfg = Release|Win32
-		{5619CA2B-6D39-4984-BE37-7580BBBD2139}.Release|Win32.Build.0 = Release|Win32
-		{5619CA2B-6D39-4984-BE37-7580BBBD2139}.Release|x64.ActiveCfg = Release|x64
-		{5619CA2B-6D39-4984-BE37-7580BBBD2139}.Release|x64.Build.0 = Release|x64
-	EndGlobalSection
-	GlobalSection(SolutionProperties) = preSolution
-		HideSolutionNode = FALSE
-	EndGlobalSection
-EndGlobal
diff --git a/third_party/double-conversion/msvc/double-conversion.vcxproj b/third_party/double-conversion/msvc/double-conversion.vcxproj
deleted file mode 100644
index e2d2ef87e..000000000
--- a/third_party/double-conversion/msvc/double-conversion.vcxproj
+++ /dev/null
@@ -1,175 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <ItemGroup Label="ProjectConfigurations">
-    <ProjectConfiguration Include="Debug|Win32">
-      <Configuration>Debug</Configuration>
-      <Platform>Win32</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="Debug|x64">
-      <Configuration>Debug</Configuration>
-      <Platform>x64</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="Release|Win32">
-      <Configuration>Release</Configuration>
-      <Platform>Win32</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="Release|x64">
-      <Configuration>Release</Configuration>
-      <Platform>x64</Platform>
-    </ProjectConfiguration>
-  </ItemGroup>
-  <PropertyGroup Label="Globals">
-    <ProjectGuid>{6863544A-0CE8-4CA9-A132-74116FD9D9BB}</ProjectGuid>
-    <Keyword>Win32Proj</Keyword>
-    <RootNamespace>doubleconversion</RootNamespace>
-  </PropertyGroup>
-  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
-    <ConfigurationType>StaticLibrary</ConfigurationType>
-    <UseDebugLibraries>true</UseDebugLibraries>
-    <PlatformToolset>v120</PlatformToolset>
-    <CharacterSet>MultiByte</CharacterSet>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
-    <ConfigurationType>StaticLibrary</ConfigurationType>
-    <UseDebugLibraries>true</UseDebugLibraries>
-    <PlatformToolset>v120</PlatformToolset>
-    <CharacterSet>MultiByte</CharacterSet>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
-    <ConfigurationType>StaticLibrary</ConfigurationType>
-    <UseDebugLibraries>false</UseDebugLibraries>
-    <PlatformToolset>v120</PlatformToolset>
-    <WholeProgramOptimization>true</WholeProgramOptimization>
-    <CharacterSet>MultiByte</CharacterSet>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
-    <ConfigurationType>StaticLibrary</ConfigurationType>
-    <UseDebugLibraries>false</UseDebugLibraries>
-    <PlatformToolset>v120</PlatformToolset>
-    <WholeProgramOptimization>true</WholeProgramOptimization>
-    <CharacterSet>MultiByte</CharacterSet>
-  </PropertyGroup>
-  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
-  <ImportGroup Label="ExtensionSettings">
-  </ImportGroup>
-  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-  </ImportGroup>
-  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
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deleted file mode 100644
index f60615855..000000000
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similarity index 100%
rename from third_party/double-conversion/double-conversion/string-to-double.cc
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similarity index 100%
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diff --git a/third_party/double-conversion/double-conversion/strtod.cc b/third_party/double-conversion/strtod.cc
similarity index 100%
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diff --git a/third_party/double-conversion/double-conversion/strtod.h b/third_party/double-conversion/strtod.h
similarity index 100%
rename from third_party/double-conversion/double-conversion/strtod.h
rename to third_party/double-conversion/strtod.h
diff --git a/third_party/double-conversion/test/CMakeLists.txt b/third_party/double-conversion/test/CMakeLists.txt
deleted file mode 100644
index 3cf444930..000000000
--- a/third_party/double-conversion/test/CMakeLists.txt
+++ /dev/null
@@ -1 +0,0 @@
-add_subdirectory(cctest)
\ No newline at end of file
diff --git a/third_party/double-conversion/test/cctest/cctest.cc b/third_party/double-conversion/test/cctest.cc
similarity index 100%
rename from third_party/double-conversion/test/cctest/cctest.cc
rename to third_party/double-conversion/test/cctest.cc
diff --git a/third_party/double-conversion/test/cctest/cctest.h b/third_party/double-conversion/test/cctest.h
similarity index 100%
rename from third_party/double-conversion/test/cctest/cctest.h
rename to third_party/double-conversion/test/cctest.h
diff --git a/third_party/double-conversion/test/cctest/CMakeLists.txt b/third_party/double-conversion/test/cctest/CMakeLists.txt
deleted file mode 100644
index 29d93d3a1..000000000
--- a/third_party/double-conversion/test/cctest/CMakeLists.txt
+++ /dev/null
@@ -1,53 +0,0 @@
-
-set(CCTEST_SRC
-  cctest.cc
-  gay-fixed.cc
-  gay-precision.cc
-  gay-shortest.cc
-  gay-shortest-single.cc
-  test-bignum.cc
-  test-bignum-dtoa.cc
-  test-conversions.cc
-  test-diy-fp.cc
-  test-dtoa.cc
-  test-fast-dtoa.cc
-  test-fixed-dtoa.cc
-  test-ieee.cc
-  test-strtod.cc
-)
-
-add_executable(cctest ${CCTEST_SRC})
-target_link_libraries(cctest double-conversion)
-if(MSVC)
-    target_compile_options(cctest PRIVATE /bigobj)
-endif()
-
-add_test(NAME test_bignum
-  WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-  COMMAND $<TARGET_FILE:cctest> test-bignum)
-
-add_test(NAME test_bignum_dtoa
-  WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-  COMMAND $<TARGET_FILE:cctest> test-bignum-dtoa)
-
-add_test(NAME test_conversions
-  WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-  COMMAND $<TARGET_FILE:cctest> test-conversions)
-add_test(NAME test_diy_fp
-  WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-  COMMAND $<TARGET_FILE:cctest> test-diy-fp)
-add_test(NAME test_dtoa
-  WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-  COMMAND $<TARGET_FILE:cctest> test-dtoa)
-add_test(NAME test_fast_dtoa
-  WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-  COMMAND $<TARGET_FILE:cctest> test-fast-dtoa)
-add_test(NAME test_fixed_dtoa
-  WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-  COMMAND $<TARGET_FILE:cctest> test-fixed-dtoa)
-add_test(NAME test_ieee
-  WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-  COMMAND $<TARGET_FILE:cctest> test-ieee)
-add_test(NAME test_strtod
-  WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-  COMMAND $<TARGET_FILE:cctest> test-strtod)
diff --git a/third_party/double-conversion/test/cctest/SConscript b/third_party/double-conversion/test/cctest/SConscript
deleted file mode 100644
index d49098074..000000000
--- a/third_party/double-conversion/test/cctest/SConscript
+++ /dev/null
@@ -1,17 +0,0 @@
-double_conversion_test_sources = [
-    'cctest.cc',
-    'gay-fixed.cc',
-    'gay-precision.cc',
-    'gay-shortest.cc',
-    'gay-shortest-single.cc',
-    'test-bignum.cc',
-    'test-bignum-dtoa.cc',
-    'test-conversions.cc',
-    'test-diy-fp.cc',
-    'test-dtoa.cc',
-    'test-fast-dtoa.cc',
-    'test-fixed-dtoa.cc',
-    'test-ieee.cc',
-    'test-strtod.cc',
-  ]
-Return('double_conversion_test_sources')
diff --git a/third_party/double-conversion/test/cctest/checks.h b/third_party/double-conversion/test/checks.h
similarity index 100%
rename from third_party/double-conversion/test/cctest/checks.h
rename to third_party/double-conversion/test/checks.h
diff --git a/third_party/double-conversion/test/cctest/gay-fixed.cc b/third_party/double-conversion/test/gay-fixed.cc
similarity index 100%
rename from third_party/double-conversion/test/cctest/gay-fixed.cc
rename to third_party/double-conversion/test/gay-fixed.cc
diff --git a/third_party/double-conversion/test/cctest/gay-fixed.h b/third_party/double-conversion/test/gay-fixed.h
similarity index 100%
rename from third_party/double-conversion/test/cctest/gay-fixed.h
rename to third_party/double-conversion/test/gay-fixed.h
diff --git a/third_party/double-conversion/test/cctest/gay-precision.cc b/third_party/double-conversion/test/gay-precision.cc
similarity index 100%
rename from third_party/double-conversion/test/cctest/gay-precision.cc
rename to third_party/double-conversion/test/gay-precision.cc
diff --git a/third_party/double-conversion/test/cctest/gay-precision.h b/third_party/double-conversion/test/gay-precision.h
similarity index 100%
rename from third_party/double-conversion/test/cctest/gay-precision.h
rename to third_party/double-conversion/test/gay-precision.h
diff --git a/third_party/double-conversion/test/cctest/gay-shortest-single.cc b/third_party/double-conversion/test/gay-shortest-single.cc
similarity index 100%
rename from third_party/double-conversion/test/cctest/gay-shortest-single.cc
rename to third_party/double-conversion/test/gay-shortest-single.cc
diff --git a/third_party/double-conversion/test/cctest/gay-shortest-single.h b/third_party/double-conversion/test/gay-shortest-single.h
similarity index 100%
rename from third_party/double-conversion/test/cctest/gay-shortest-single.h
rename to third_party/double-conversion/test/gay-shortest-single.h
diff --git a/third_party/double-conversion/test/cctest/gay-shortest.cc b/third_party/double-conversion/test/gay-shortest.cc
similarity index 100%
rename from third_party/double-conversion/test/cctest/gay-shortest.cc
rename to third_party/double-conversion/test/gay-shortest.cc
diff --git a/third_party/double-conversion/test/cctest/gay-shortest.h b/third_party/double-conversion/test/gay-shortest.h
similarity index 100%
rename from third_party/double-conversion/test/cctest/gay-shortest.h
rename to third_party/double-conversion/test/gay-shortest.h
diff --git a/third_party/double-conversion/test/cctest/test-bignum-dtoa.cc b/third_party/double-conversion/test/test-bignum-dtoa.cc
similarity index 100%
rename from third_party/double-conversion/test/cctest/test-bignum-dtoa.cc
rename to third_party/double-conversion/test/test-bignum-dtoa.cc
diff --git a/third_party/double-conversion/test/cctest/test-bignum.cc b/third_party/double-conversion/test/test-bignum.cc
similarity index 100%
rename from third_party/double-conversion/test/cctest/test-bignum.cc
rename to third_party/double-conversion/test/test-bignum.cc
diff --git a/third_party/double-conversion/test/cctest/test-conversions.cc b/third_party/double-conversion/test/test-conversions.cc
similarity index 100%
rename from third_party/double-conversion/test/cctest/test-conversions.cc
rename to third_party/double-conversion/test/test-conversions.cc
diff --git a/third_party/double-conversion/test/cctest/test-diy-fp.cc b/third_party/double-conversion/test/test-diy-fp.cc
similarity index 100%
rename from third_party/double-conversion/test/cctest/test-diy-fp.cc
rename to third_party/double-conversion/test/test-diy-fp.cc
diff --git a/third_party/double-conversion/test/cctest/test-dtoa.cc b/third_party/double-conversion/test/test-dtoa.cc
similarity index 100%
rename from third_party/double-conversion/test/cctest/test-dtoa.cc
rename to third_party/double-conversion/test/test-dtoa.cc
diff --git a/third_party/double-conversion/test/cctest/test-fast-dtoa.cc b/third_party/double-conversion/test/test-fast-dtoa.cc
similarity index 100%
rename from third_party/double-conversion/test/cctest/test-fast-dtoa.cc
rename to third_party/double-conversion/test/test-fast-dtoa.cc
diff --git a/third_party/double-conversion/test/cctest/test-fixed-dtoa.cc b/third_party/double-conversion/test/test-fixed-dtoa.cc
similarity index 100%
rename from third_party/double-conversion/test/cctest/test-fixed-dtoa.cc
rename to third_party/double-conversion/test/test-fixed-dtoa.cc
diff --git a/third_party/double-conversion/test/cctest/test-ieee.cc b/third_party/double-conversion/test/test-ieee.cc
similarity index 100%
rename from third_party/double-conversion/test/cctest/test-ieee.cc
rename to third_party/double-conversion/test/test-ieee.cc
diff --git a/third_party/double-conversion/test/cctest/test-strtod.cc b/third_party/double-conversion/test/test-strtod.cc
similarity index 100%
rename from third_party/double-conversion/test/cctest/test-strtod.cc
rename to third_party/double-conversion/test/test-strtod.cc
diff --git a/third_party/double-conversion/double-conversion/utils.h b/third_party/double-conversion/utils.h
similarity index 100%
rename from third_party/double-conversion/double-conversion/utils.h
rename to third_party/double-conversion/utils.h