diff --git a/.github/actions/build/action.yml b/.github/actions/build/action.yml
index daac20e..ed5e6c9 100644
--- a/.github/actions/build/action.yml
+++ b/.github/actions/build/action.yml
@@ -36,13 +36,13 @@ runs:
         export B2_CI_VERSION=1
         export B2_CXXSTD=20
         export B2_VARIANT=debug
-        export B2_TARGETS=${{ github.targets }}
+        export B2_TARGETS="${{ inputs.targets }}"
         export B2_FLAGS="link=shared cxxflags=-fkeep-static-functions cxxflags=--coverage linkflags=--coverage"
-        export DRONE_BUILD_EVENT=${{ github.event_name }}
+        export DRONE_BUILD_EVENT="${{ github.event_name }}"
         export DRONE_JOB_BUILDTYPE=boost
-        export DRONE_COMMIT=${{ github.sha }}
-        export DRONE_BRANCH=${{ inputs.ref }}
-        export DRONE_REPO=${{ inputs.repo }}
+        export DRONE_COMMIT="${{ github.sha }}"
+        export DRONE_BRANCH="${{ inputs.ref }}"
+        export DRONE_REPO="${{ inputs.repo }}"
 
         cd ${{ inputs.path }}
         . .drone/drone.sh
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 516345d..a929b30 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,7 +26,7 @@ jobs:
           repository: booostorg/json
           ref: ${{ steps.fetch-target.outputs.ref }}
           commit: ${{ steps.fetch-target.outputs.commit }}
-          targets: libs/json/test
+          targets: libs/json/test libs/json/example libs/json/bench
 
       - id: fetch-baseline
         name: Fetch Boost.JSON baseline
@@ -43,7 +43,7 @@ jobs:
           repository: booostorg/json
           ref: ${{ steps.fetch-baseline.outputs.ref }}
           commit: ${{ steps.fetch-baseline.outputs.commit }}
-          targets: libs/json/test
+          targets: libs/json/test libs/json/example libs/json/bench
 
       - name: Collect coverage
         run: |
@@ -73,16 +73,16 @@ jobs:
           lcov --remove target/filter1.info '*/json/test/*' '*/json/bench/*' \
             '*/json/example/*' --output-file target/filter2.info
 
-          git diff -U0 --no-indent-heuristic --minimal \
-            base/boost-root/libs/json target/boost-root/libs/json >diff
+          git diff -U0 --no-indent-heuristic --minimal --no-index \
+            base/boost-root/libs/json target/boost-root/libs/json | tee diff
 
           ./diff-coverage-report.py -O pages -S target/boost-root/libs/json \
             -B base/filter2.info -T target/filter2.info -D diff \
             -P $PWD/base/boost-root/boost $PWD/target/boost-root/libs/json/include/boost \
                $PWD/target/boost-root/boost $PWD/target/boost-root/libs/json/include/boost \
                $PWD/base/boost-root $PWD/target/boost-root \
-               1/base/boost-root $PWD/target/boost-root \
-               2/target/boost-root $PWD/target/boost-root
+               a/base/boost-root $PWD/target/boost-root \
+               b/target/boost-root $PWD/target/boost-root
 
       - name: Save coverage info
         uses: actions/upload-artifact@v4
diff --git a/diff-coverage-report.py b/diff-coverage-report.py
index e5b21e4..8f8e5c3 100755
--- a/diff-coverage-report.py
+++ b/diff-coverage-report.py
@@ -238,6 +238,11 @@ def commit():
         elif l.startswith('+++ '):
             _, new_file = l.split(' ', 1)
             new_file = fix_path(new_file.rstrip(), prefix_map)
+            if old_file != new_file:
+                if old_file == '/dev/null':
+                    old_file = new_file
+                elif new_file == '/dev/null':
+                    new_file = old_file
             assert old_file == new_file
 
             file_data = result.get(new_file)
@@ -249,8 +254,18 @@ def commit():
             _, old_range, new_range, _ = l.split(' ', 3)
             assert old_range[0] == '-'
             assert new_range[0] == '+'
-            old_line, old_count = [int(x) for x in old_range[1:].split(',')]
-            new_line, new_count = [int(x) for x in new_range[1:].split(',')]
+            old_range = [int(x) for x in old_range[1:].split(',')]
+            if len(old_range) > 1:
+                old_line, old_count = old_range
+            else:
+                old_line = old_range[0]
+                old_count = 1
+            new_range = [int(x) for x in new_range[1:].split(',')]
+            if len(new_range) > 1:
+                new_line, new_count = new_range
+            else:
+                new_line = new_range[0]
+                new_count = 1
 
         elif l.startswith(' '):
             old_line += 1