diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index bede8f33..de206595 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -5,29 +5,7 @@ name: Linux Build
 
 on:
   push:
-    branches: ["main"]
-    paths:
-      - "include/**"
-      - "src/**"
-      - "tests/**"
-      - "examples/**"
-      - "cmake/**"
-      - "Makefile"
-      - "CMakePresets.json"
-      - "CMakeLists.txt"
-      - ".github/workflows/linux.yml"
   pull_request:
-    branches: ["main"]
-    paths:
-      - "include/**"
-      - "src/**"
-      - "tests/**"
-      - "examples/**"
-      - "cmake/**"
-      - "Makefile"
-      - "CMakePresets.json"
-      - "CMakeLists.txt"
-      - ".github/workflows/linux.yml"
 
 jobs:
   build:
@@ -38,7 +16,8 @@ jobs:
       matrix:
         # TODO: sanitizer: [debug, release, asan, usan, tsan, lsan, msan]
         preset: [debug, release]
-        compiler: [g++-14, clang++-19]
+        # TODO: compiler: [g++-15, clang++-19]
+        compiler: [clang++-19]
 
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index d4de55eb..55d2f907 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -5,29 +5,7 @@ name: Macos Build
 
 on:
   push:
-    branches: ["main"]
-    paths:
-      - "include/**"
-      - "src/**"
-      - "tests/**"
-      - "examples/**"
-      - "cmake/**"
-      - "Makefile"
-      - "CMakePresets.json"
-      - "CMakeLists.txt"
-      - ".github/workflows/macos.yml"
   pull_request:
-    branches: ["main"]
-    paths:
-      - "include/**"
-      - "src/**"
-      - "tests/**"
-      - "examples/**"
-      - "cmake/**"
-      - "Makefile"
-      - "CMakePresets.json"
-      - "CMakeLists.txt"
-      - ".github/workflows/macos.yml"
 
 jobs:
   build:
@@ -37,8 +15,8 @@ jobs:
 
       matrix:
         preset: [debug, release]
-        # TODO: compiler: [g++, clang++-19]
-        compiler: [g++, clang++-18]
+        # TODO: compiler: [g++-15, clang++-19]
+        compiler: [clang++-19]
 
     steps:
       - uses: actions/checkout@v4
@@ -47,9 +25,6 @@ jobs:
         # if: startsWith(matrix.compiler, 'clang')
         uses: aminya/setup-cpp@v1
         with:
-          # TODO: compiler: llvm-19
-          # clangtidy: true
-          # cmake: true
           ninja: true
 
       - name: Install llvm-19
@@ -57,13 +32,13 @@ jobs:
         run: |
           brew install llvm@19 || echo ignored
 
-      - name: macos clang++-18 ${{ matrix.preset }}
+      - name: macos clang++-19 ${{ matrix.preset }}
         if: startsWith(matrix.compiler, 'clang')
-        run: CXX=$(brew --prefix llvm@18)/bin/clang++ cmake --workflow --preset ${{ matrix.preset }}
+        run: CXX=$(brew --prefix llvm@19)/bin/clang++ cmake --workflow --preset ${{ matrix.preset }}
 
-      - name: macos clang++-18 sanitizer
+      - name: macos clang++-19 sanitizer
         if: startsWith(matrix.compiler, 'clang') && startsWith(matrix.preset, 'debug')
-        run: CXX=$(brew --prefix llvm@18)/bin/clang++ make all
+        run: CXX=$(brew --prefix llvm@19)/bin/clang++ make all
 
       - name: macos g++ ${{ matrix.preset }}
         if: startsWith(matrix.compiler, 'g++')
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 3474fcd2..0f9506dd 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -5,27 +5,7 @@ name: Windows Build
 
 on:
   push:
-    branches: ["main"]
-    paths:
-      - "include/**"
-      - "src/**"
-      - "tests/**"
-      - "examples/**"
-      - "cmake/**"
-      - "CMakePresets.json"
-      - "CMakeLists.txt"
-      - ".github/workflows/windows.yml"
   pull_request:
-    branches: ["main"]
-    paths:
-      - "include/**"
-      - "src/**"
-      - "tests/**"
-      - "examples/**"
-      - "cmake/**"
-      - "CMakePresets.json"
-      - "CMakeLists.txt"
-      - ".github/workflows/windows.yml"
 
 jobs:
   build:
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4b1fdee4..84149c09 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,15 +3,18 @@
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 # cmake-format: on
 
-cmake_minimum_required(VERSION 3.25...3.31)
+cmake_minimum_required(VERSION 3.30...3.31)
 
-project(beman_execution26 VERSION 0.0.1 LANGUAGES CXX)
+project(beman_execution26 VERSION 0.1.0 LANGUAGES CXX)
 
 if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})
   message(FATAL_ERROR "In-source builds are not allowed!")
 endif()
 
-set(CMAKE_CXX_SCAN_FOR_MODULES ON)
+# Note that scanning is only performed if C++20 or higher is enabled for the target. Scanning for modules in the target's
+# sources belonging to file sets of type CXX_MODULES is always performed.
+# not needed: set(CMAKE_CXX_SCAN_FOR_MODULES ON)
+
 set(TARGET_NAME execution26)
 set(TARGET_NAMESPACE beman) # FIXME: not used in install(EXPORT ...) CK?
 set(TARGET_PREFIX ${TARGET_NAMESPACE}.${TARGET_NAME})
@@ -20,6 +23,9 @@ set(TARGET_ALIAS ${TARGET_LIBRARY}::${TARGET_LIBRARY})
 set(TARGET_PACKAGE_NAME ${PROJECT_NAME}-config)
 set(TARGETS_EXPORT_NAME ${PROJECT_NAME}-targets)
 
+# This variable is a special case of the more-general CMAKE_<CONFIG>_POSTFIX variable for the DEBUG configuration.
+set(CMAKE_DEBUG_POSTFIX D)
+
 include(GNUInstallDirs)
 set(INSTALL_CONFIGDIR ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
 
@@ -56,7 +62,7 @@ if(CMAKE_BUILD_TYPE STREQUAL Debug)
     ENABLE_SANITIZER_POINTER_COMPARE
     ENABLE_SANITIZER_POINTER_SUBTRACT
     ENABLE_CONTROL_FLOW_PROTECTION
-    ENABLE_STACK_PROTECTION
+    # XXX ENABLE_STACK_PROTECTION
     ENABLE_OVERFLOW_PROTECTION
     # ENABLE_ELF_PROTECTION
     # ENABLE_RUNTIME_SYMBOLS_RESOLUTION
@@ -86,7 +92,7 @@ include(CMakePackageConfigHelpers)
 write_basic_package_version_file(
   ${CMAKE_CURRENT_BINARY_DIR}/${TARGET_PACKAGE_NAME}-version.cmake
   VERSION ${CMAKE_PROJECT_VERSION}
-  COMPATIBILITY AnyNewerVersion
+  COMPATIBILITY SameMajorVersion
 )
 
 configure_package_config_file(
diff --git a/cmake/CMakeGenericPresets.json b/cmake/CMakeGenericPresets.json
index 7014512d..44fd4775 100644
--- a/cmake/CMakeGenericPresets.json
+++ b/cmake/CMakeGenericPresets.json
@@ -12,7 +12,7 @@
           "type": "path",
           "value": "${sourceDir}/stagedir"
         },
-        "CMAKE_CXX_EXTENSIONS": false,
+        "CMAKE_CXX_EXTENSIONS": true,
         "CMAKE_CXX_STANDARD": "23",
         "CMAKE_CXX_STANDARD_REQUIRED": true,
         "CMAKE_EXPORT_COMPILE_COMMANDS": true,
diff --git a/examples/modules.cpp b/examples/modules.cpp
index 9d5babe0..c76e60b2 100644
--- a/examples/modules.cpp
+++ b/examples/modules.cpp
@@ -3,12 +3,18 @@
 
 // import std;
 #include <iostream>
+#include <string>
 #if __cpp_modules < 201907L
 #include <beman/execution26/execution.hpp>
 #else
-import beman.execution26;
+import beman_execution26;
 #endif
 
 namespace ex = beman::execution26;
 
-int main() {}
+int main() {
+    auto [result] = ex::sync_wait(ex::when_all(ex::just(std::string("hello, ")), ex::just(std::string("world"))) |
+                                  ex::then([](const auto& s1, const auto& s2) { return s1 + s2; }))
+                        .value_or(std::tuple(std::string("oops")));
+    std::cout << "result='" << result << "'\n";
+}
diff --git a/src/beman/execution26/CMakeLists.txt b/src/beman/execution26/CMakeLists.txt
index 12ba05f1..9380b125 100644
--- a/src/beman/execution26/CMakeLists.txt
+++ b/src/beman/execution26/CMakeLists.txt
@@ -7,7 +7,8 @@ add_library(${TARGET_LIBRARY} STATIC)
 add_library(${TARGET_ALIAS} ALIAS ${TARGET_LIBRARY})
 
 if(CMAKE_BUILD_TYPE STREQUAL Debug)
-  target_link_libraries(${TARGET_LIBRARY} PUBLIC $<BUILD_INTERFACE:${TARGET_LIBRARY}_project_options>)
+  # NOTE: Sanitizer or gcov is not possible for CXX_MODULES! CK
+  # XXX target_link_libraries(${TARGET_LIBRARY} PUBLIC $<BUILD_INTERFACE:${TARGET_LIBRARY}_project_options>)
   target_link_libraries(${TARGET_LIBRARY} PUBLIC $<BUILD_INTERFACE:${TARGET_LIBRARY}_project_warnings>)
 endif()
 
@@ -188,33 +189,26 @@ target_compile_features(${TARGET_LIBRARY} PUBLIC
 )
 
 target_sources(
-  beman_execution26
-  PUBLIC FILE_SET
-         beman_execution26 TYPE CXX_MODULES FILES execution.cpp
+  ${TARGET_LIBRARY}
+  PUBLIC FILE_SET ${TARGET_LIBRARY}_modules
+         TYPE CXX_MODULES FILES execution.cppm
 )
 
-if(FALSE)
 install(
   TARGETS ${TARGET_LIBRARY}
-  EXPORT ${TARGETS_EXPORT_NAME}1
-  ARCHIVE DESTINATION lib/$<CONFIG>
+  EXPORT ${TARGETS_EXPORT_NAME}
+  ARCHIVE # XXX DESTINATION lib/$<CONFIG>
+  FILE_SET ${TARGET_LIBRARY}_modules
+    # There's currently no convention for this location
+    DESTINATION ${INSTALL_CONFIGDIR}/src
   FILE_SET ${TARGET_LIBRARY}_public_headers
   FILE_SET ${TARGET_LIBRARY}_detail_headers
 )
 
 install(
-  EXPORT ${TARGETS_EXPORT_NAME}1
-  FILE ${TARGETS_EXPORT_NAME}.cmake
+  EXPORT ${TARGETS_EXPORT_NAME}
   DESTINATION "${INSTALL_CONFIGDIR}"
+  CXX_MODULES_DIRECTORY .
   NAMESPACE ${TARGET_LIBRARY}::
 )
-
-#-dk:TODO build/default/src/beman/execution26/CMakeFiles/beman_execution26.dir/beman.execution26.pcm
-install(
-  TARGETS beman_execution26
-  EXPORT beman_execution26
-  COMPONENT FILE_SET beman_execution26
-  DESTINATION lib/beman/execution26
-)
-endif()
-# cmake-format: on
\ No newline at end of file
+# cmake-format: on
diff --git a/src/beman/execution26/execution.cpp b/src/beman/execution26/execution.cppm
similarity index 99%
rename from src/beman/execution26/execution.cpp
rename to src/beman/execution26/execution.cppm
index b79929ad..c1390eb9 100644
--- a/src/beman/execution26/execution.cpp
+++ b/src/beman/execution26/execution.cppm
@@ -8,7 +8,7 @@ module;
 #include <beman/execution26/execution.hpp>
 #include <beman/execution26/stop_token.hpp>
 
-export module beman.execution26;
+export module beman_execution26;
 
 namespace beman::execution26 {
 export int version(0);
diff --git a/tests/beman/execution26/CMakeLists.txt b/tests/beman/execution26/CMakeLists.txt
index 5e1c773f..8c8bcfce 100644
--- a/tests/beman/execution26/CMakeLists.txt
+++ b/tests/beman/execution26/CMakeLists.txt
@@ -1,6 +1,6 @@
 # src/beman/execution26/tests/CMakeLists.txt
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-cmake_minimum_required(VERSION 3.25...3.31)
+cmake_minimum_required(VERSION 3.30...3.31)
 
 project(beman_execution26_tests LANGUAGES CXX)
 
@@ -8,12 +8,7 @@ if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})
   message(FATAL_ERROR "In-source builds are not allowed!")
 endif()
 
-list(
-  APPEND
-  execution_tests
-  execution-module.test
-  stop-token-module.test
-)
+list(APPEND execution_tests execution-module.test stop-token-module.test)
 
 list(
   APPEND
@@ -113,9 +108,10 @@ endif()
 
 if(PROJECT_IS_TOP_LEVEL)
   enable_testing()
-  find_package(beman_execution26 0.0.1 EXACT QUIET)
+  find_package(beman_execution26 0.1.0 EXACT QUIET)
   if(beman_execution26_FOUND)
-    set(execution_tests exec-awaitable.test) # only one sample to save time! CK
+    set(execution_tests exec-awaitable.test) # only some samples to save time! CK
+    list(APPEND execution_tests execution-module.test)
   else()
     add_subdirectory(../../.. beman_execution26)
 
@@ -133,27 +129,24 @@ foreach(test ${execution_tests})
   add_test(NAME ${TEST_EXE} COMMAND $<TARGET_FILE:${TEST_EXE}>)
 endforeach()
 
-if(FALSE)
 if(NOT PROJECT_IS_TOP_LEVEL)
-  # test if the targets are findable from the build directory
+  # test if the targets are findable from the install directory
   # cmake-format: off
-  add_test(NAME find-package-test
-    COMMAND ${CMAKE_CTEST_COMMAND}
-      # --verbose
-      --output-on-failure
-      -C $<CONFIG>
-      --build-and-test
-          "${CMAKE_CURRENT_SOURCE_DIR}"
-          "${CMAKE_CURRENT_BINARY_DIR}/find-package-test"
-      --build-generator ${CMAKE_GENERATOR}
-      --build-makeprogram ${CMAKE_MAKE_PROGRAM}
-      --build-options
-          "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}"
-          "-DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD}"
-          "-DCMAKE_BUILD_TYPE=$<CONFIG>"
-          "-DCMAKE_PREFIX_PATH=${CMAKE_PREFIX_PATH}"
-          # TODO(CK): Needed too? "--config $<CONFIG>"
-  )
-  # cmake-format: on
-endif()
+add_test(NAME find-package-test
+  COMMAND ${CMAKE_CTEST_COMMAND}
+    # --verbose
+    --output-on-failure
+    -C $<CONFIG>
+    --build-and-test
+        "${CMAKE_CURRENT_SOURCE_DIR}"
+        "${CMAKE_CURRENT_BINARY_DIR}/find-package-test"
+    --build-generator ${CMAKE_GENERATOR}
+    --build-makeprogram ${CMAKE_MAKE_PROGRAM}
+    --build-options
+        "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}"
+        "-DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD}"
+        "-DCMAKE_BUILD_TYPE=$<CONFIG>"
+        "-DCMAKE_PREFIX_PATH=${CMAKE_PREFIX_PATH}"
+)
+# cmake-format: on
 endif()
diff --git a/tests/beman/execution26/execution-module.test.cpp b/tests/beman/execution26/execution-module.test.cpp
index 70d3235b..d7604a7a 100644
--- a/tests/beman/execution26/execution-module.test.cpp
+++ b/tests/beman/execution26/execution-module.test.cpp
@@ -5,7 +5,7 @@
 #if 0
 #include <beman/execution26/execution.hpp>
 #else
-import beman.execution26;
+import beman_execution26;
 #endif
 
 // ----------------------------------------------------------------------------
@@ -172,8 +172,8 @@ TEST(execution_modules) {
 
     // [exec.util.cmplsig.trans]
     //-dk:TODO template <typename S> using transform_completion_signatures =
-    //test_stdex::transform_completion_signatures<S>; -dk:TODO template <typename S> using
-    //transform_completion_signatures_of = test_stdex::transform_completion_signatures_of<S>;
+    // test_stdex::transform_completion_signatures<S>; -dk:TODO template <typename S> using
+    // transform_completion_signatures_of = test_stdex::transform_completion_signatures_of<S>;
 
     // [exec.run.loop], run_loop
     test::use_type<test_stdex::run_loop>();
@@ -191,4 +191,4 @@ TEST(execution_modules) {
 
     // [exec.with.awaitable.senders]
     //-dk:TODO test::use_template<test_stdex::with_awaitable_senders>();
-}
\ No newline at end of file
+}
diff --git a/tests/beman/execution26/include/test/execution.hpp b/tests/beman/execution26/include/test/execution.hpp
index 11be536a..4c6c08ed 100644
--- a/tests/beman/execution26/include/test/execution.hpp
+++ b/tests/beman/execution26/include/test/execution.hpp
@@ -16,7 +16,7 @@
 
 namespace beman::execution26 {}
 
-namespace beman::execution26::detail {};
+namespace beman::execution26::detail {}
 
 namespace test_std    = ::beman::execution26;
 namespace test_stdex           = ::beman::execution26;
diff --git a/tests/beman/execution26/stop-token-module.test.cpp b/tests/beman/execution26/stop-token-module.test.cpp
index 2bc4f94f..02756d97 100644
--- a/tests/beman/execution26/stop-token-module.test.cpp
+++ b/tests/beman/execution26/stop-token-module.test.cpp
@@ -5,7 +5,7 @@
 #if 0
 #include <beman/execution26/execution.hpp>
 #else
-import beman.execution26;
+import beman_execution26;
 #endif
 
 // ----------------------------------------------------------------------------
@@ -39,4 +39,4 @@ TEST(stop_token_modules) {
     // [stopcallback.inplace], class template inplace_stop_callback
     test::use_template<test_std::inplace_stop_callback>();
     test::use_template<test_std::stop_callback_for_t>();
-}
\ No newline at end of file
+}