try without any lists

run failed. Didn't get out of the gate. Try making true a bollean
always despite

  https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstrategyfail-fast

example of:

jobs:
  test:
    runs-on: ubuntu-latest
    continue-on-error: ${{ matrix.experimental }}
    strategy:
      fail-fast: true
      matrix:
        version: [6, 7, 8]
        experimental: [false]
        include:
          - version: 9
            experimental: true

as error annotation from github is:

  Error when evaluating 'continue-on-error' for job
  'test'. .github/workflows/ci-test.yml (Line: 37, Col: 24): A sequence
  was not expected


[skip travis]

Author: rouilj

.github/workflows/ci-test.yml

@@ -61,13 +61,13 @@ jobs:
         os: [ubuntu-latest, ubuntu-20.04]
 
         # if the ones above fail. fail the build
-        experimental: [false]
+        experimental: false
 
         include:
             # example: if 3.12 fails the jobs still succeeds
             - python-version: 3.12 
               os: ubuntu-22.04
-              experimental: [true]
+              experimental: true
 
             # 3.6 not available on new 22.04 runners, so run on 20.04 ubuntu
             - python-version: 3.6