diff --git a/.github/workflows/fatman.yml b/.github/workflows/fatman.yml
new file mode 100644
index 0000000000..b7c7a0723d
--- /dev/null
+++ b/.github/workflows/fatman.yml
@@ -0,0 +1,72 @@
+# The fat man: clones every external module into modules/ and builds ONE daslang host
+# with all of them statically linked (the superbuild half of the externals' both-worlds
+# CMakeLists — the half no other CI exercises; each module's own CI covers the
+# standalone .shared_module half). Runs examples/fatman/main.das, which requires every
+# external module: registration + boost-path resolution + the static link, no window,
+# no GPU. Also the compile-time ABI canary for daslang-vs-externals drift.
+name: fatman
+
+on:
+  pull_request:
+    paths:
+      - 'CMakeLists.txt'
+      - 'web/CMakeLists.txt'
+      - 'examples/fatman/**'
+      - '.github/workflows/fatman.yml'
+      - 'include/**'
+      - 'src/**'
+  workflow_dispatch:
+
+concurrency:
+  group: fatman-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  fatman:
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: "Install CMake and Ninja"
+        uses: lukka/get-cmake@latest
+
+      - name: "Install: Required Dev Packages"
+        run: |
+          set -eux
+          sudo apt-get update -y
+          sudo apt-get install --no-install-recommends -y \
+            libatomic-ops-dev \
+            libglu1-mesa-dev \
+            mesa-common-dev \
+            libx11-dev \
+            libxrandr-dev \
+            libxcursor-dev \
+            libxinerama-dev \
+            libxi-dev
+
+      - name: "Clone external modules into modules/ (master; no .daspkg_standalone marker => the modules glob includes their both-worlds CMakeLists)"
+        run: |
+          set -eux
+          git clone --depth 1 --recurse-submodules https://github.com/borisbat/dasImgui.git          modules/dasImgui
+          git clone --depth 1 --recurse-submodules https://github.com/borisbat/dasImguiImplot.git    modules/dasImguiImplot
+          git clone --depth 1 --recurse-submodules https://github.com/borisbat/dasImguiNodeEditor.git modules/dasImguiNodeEditor
+          git clone --depth 1 --recurse-submodules https://github.com/borisbat/dasVulkan.git         modules/dasVulkan
+
+      - name: "Configure (externals absorbed by the modules glob)"
+        run: |
+          set -eux
+          cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Release \
+            -DDAS_GLFW_DISABLED=OFF
+
+      - name: "Build the fat host (daslang_static — the flavor that links the static module halves; the DLL-flavor daslang gets externals via .shared_module at runtime instead)"
+        run: |
+          set -eux
+          cmake --build build --target daslang_static -j $(nproc)
+
+      - name: "Run the fat man"
+        run: |
+          set -eux
+          ./bin/daslang_static examples/fatman/main.das
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 31d22efbbb..e010f74d0f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -612,9 +612,12 @@ IF(EMSCRIPTEN AND DAS_WEB_IMGUI_DIR)
             ADD_MODULE_DAS(imgui imgui ${_n})
         ENDIF()
     ENDFOREACH()
-    # imgui_boost_v2: module name differs from its file (widgets/imgui_boost.das). The
-    # web embed mounts that file as imgui_boost_v2.das so this resolves.
-    ADD_MODULE_DAS(imgui imgui imgui_boost_v2)
+    # Pre-rename dasImgui kept module imgui_boost_v2 in widgets/imgui_boost.das (the web
+    # embed mounts it under the module name); post-rename (dasImgui #218) the glob above
+    # already registered it. Tolerate both layouts.
+    IF(NOT EXISTS "${DAS_WEB_IMGUI_DIR}/widgets/imgui_boost_v2.das")
+        ADD_MODULE_DAS(imgui imgui imgui_boost_v2)
+    ENDIF()
     UNSET(_module)
     # C++ binding modules: register_Module_dasIMGUI / _imgui_app / _imgui_app_headless,
     # pulled from the prebuilt wasm32 archives linked in web/CMakeLists.txt.
diff --git a/examples/fatman/main.das b/examples/fatman/main.das
new file mode 100644
index 0000000000..d52d8459f0
--- /dev/null
+++ b/examples/fatman/main.das
@@ -0,0 +1,31 @@
+options gen2
+options indenting = 4
+
+// The fat man: statically links every external module into one host and requires them
+// all. Exists purely to CI-gate the superbuild (static-embed) half of the external
+// modules' both-worlds CMakeLists — the standalone .shared_module half each module's
+// own CI covers. Build recipe: clone the externals into modules/ of a daslang checkout
+// (no .daspkg_standalone marker), configure + build the daslang target, run this file.
+// A `require` proves registration + boost-path resolution + the static link; nothing
+// here opens a window or touches a GPU, so it runs on any CI runner.
+
+// C++ binding modules (require-to-link is the whole test, hence the nolints)
+require imgui                       // nolint:STYLE030
+require imgui_app                   // nolint:STYLE030
+require imgui_app_headless          // nolint:STYLE030
+require implot                      // nolint:STYLE030
+require imgui_node_editor           // nolint:STYLE030
+require vulkan                      // nolint:STYLE030
+
+// one boost path per external — proves the ADD_MODULE_DAS registrations resolve
+require imgui/imgui_boost_v2
+require imgui/imgui_theme_daslang   // nolint:STYLE030
+require imgui/imgui_implot_boost_v2
+require imgui/imgui_node_editor_boost_v2
+require vulkan/vulkan_boost         // nolint:STYLE030
+require vulkan/spirv_vulkan_shader
+
+[export]
+def main {
+    print("the fat man stands: imgui + imgui_app(+headless) + implot + node_editor + vulkan all statically linked\n")
+}
diff --git a/include/daScript/simulate/aot.h b/include/daScript/simulate/aot.h
index ce2624e32d..c55357c17c 100644
--- a/include/daScript/simulate/aot.h
+++ b/include/daScript/simulate/aot.h
@@ -3079,7 +3079,7 @@ namespace das {
 
     template <typename TT, typename QQ = typename TT::value_type>
     __forceinline void das_vector_push ( TT & vec, const QQ & value, int32_t at, Context * context ) {
-        if ( uint32_t(at)>vec.size() ) {
+        if ( uint32_t(at)>uint32_t(vec.size()) ) {   // both sides cast: ImVector::size() is int, std::vector's is size_t
             context->throw_error_ex("insert index out of range, %i of %u", at, uint32_t(vec.size()));
         }
         (void)value;
@@ -3089,7 +3089,7 @@ namespace das {
 
     template <typename TT, typename QQ = typename TT::value_type>
     __forceinline void das_vector_push_value ( TT & vec, QQ value, int32_t at, Context * context ) {
-        if ( uint32_t(at)>vec.size() ) {
+        if ( uint32_t(at)>uint32_t(vec.size()) ) {   // both sides cast: ImVector::size() is int, std::vector's is size_t
             context->throw_error_ex("insert index out of range, %i of %u", at, uint32_t(vec.size()));
         }
         (void)value;
@@ -3099,7 +3099,7 @@ namespace das {
 
     template <typename TT, typename QQ = typename TT::value_type>
     __forceinline void das_vector_push_empty ( TT & vec, int32_t at, Context * context ) {
-        if ( uint32_t(at)>vec.size() ) {
+        if ( uint32_t(at)>uint32_t(vec.size()) ) {   // both sides cast: ImVector::size() is int, std::vector's is size_t
             context->throw_error_ex("insert index out of range, %i of %u", at, uint32_t(vec.size()));
         }
         if constexpr (das::is_stub_type<QQ>::value) { DAS_ASSERTF(false, "STUB!"); }
@@ -3159,7 +3159,7 @@ namespace das {
 
     template <typename TT, typename QQ = typename TT::value_type>
     __forceinline void das_vector_erase ( TT & vec, int32_t index, Context * context ) {
-        if ( uint32_t(index)>vec.size() ) {
+        if ( uint32_t(index)>uint32_t(vec.size()) ) {   // both sides cast: ImVector::size() is int, std::vector's is size_t
             context->throw_error_ex("erasing vector index out of range %i of %i", index, int32_t(vec.size()));
         }
         if constexpr (das::is_stub_type<QQ>::value) { DAS_ASSERTF(false, "STUB!"); }
diff --git a/web/CMakeLists.txt b/web/CMakeLists.txt
index 7c9bbfd9e6..5d0e230241 100644
--- a/web/CMakeLists.txt
+++ b/web/CMakeLists.txt
@@ -165,9 +165,12 @@ add_link_options("SHELL:--embed-file ${CMAKE_CURRENT_SOURCE_DIR}/../modules/dasA
 IF(DAS_WEB_IMGUI_DIR)
     MESSAGE(STATUS "web: embedding dasImgui (${DAS_WEB_IMGUI_DIR}) into daslang_static")
     add_link_options("SHELL:--embed-file ${DAS_WEB_IMGUI_DIR}/widgets@modules/dasImgui/imgui")
-    # module imgui_boost_v2 lives in the file widgets/imgui_boost.das; the NATIVE_MODULE
-    # resolver maps require imgui/imgui_boost_v2 -> imgui_boost_v2.das, so mount it there too.
-    add_link_options("SHELL:--embed-file ${DAS_WEB_IMGUI_DIR}/widgets/imgui_boost.das@modules/dasImgui/imgui/imgui_boost_v2.das")
+    # Pre-rename dasImgui kept module imgui_boost_v2 in the file widgets/imgui_boost.das;
+    # post-rename (dasImgui #218) the file carries the module's own name and the widgets/
+    # embed above already covers it. Tolerate both layouts.
+    IF(NOT EXISTS "${DAS_WEB_IMGUI_DIR}/widgets/imgui_boost_v2.das")
+        add_link_options("SHELL:--embed-file ${DAS_WEB_IMGUI_DIR}/widgets/imgui_boost.das@modules/dasImgui/imgui/imgui_boost_v2.das")
+    ENDIF()
     add_link_options("SHELL:--embed-file ${DAS_WEB_IMGUI_DIR}/font/JetBrainsMono-Regular.ttf@modules/dasImgui/font/JetBrainsMono-Regular.ttf")
     add_link_options("SHELL:--embed-file ${CMAKE_CURRENT_SOURCE_DIR}/../modules/dasLiveHost/live@modules/dasLiveHost/live")
 ENDIF()