Unable to trigger conditional workflow with boolean value #2

Build Environment
1

Hello. I’m trying to use conditional workflows triggered by curl but running into an issue that circleci is interpreting the boolean value in my JSON payload as string. Basically the same problem as this person had: Unable to trigger conditional workflow with boolean value

#!/bin/sh -eo pipefail
# Type error for argument run_backend: expected type: boolean, actual value: \"true\" (type string)
# 
# -------
# Warning: This configuration was auto-generated to show you the message above.
# Don't rerun this job. Rerunning will have no effect.
false
Exited with code 1

Here is the relevant part of my config.yml:

version: 2.1
parameters:
  run_backend:
    type: boolean
    default: false
jobs:
  backend:
    docker:
      - image: circleci/node:12.10
    steps:
      - run: |
          echo foo
workflows:
  version: 2
  backend:
    when: << pipeline.parameters.run_backend >>
    jobs:
      - backend

And this is how I’m triggering the build:

curl -u ${CIRCLE_TOKEN}: -X POST \
  --header "Content-Type: application/json" \
  -d '{"parameters":{"run_backend":true}}' \
  https://circleci.com/api/v2/project/git/raine/education-platform/pipeline
2

After some time this has now started to work, with the only change being that git in URL now has to be github. git has been allowed previously but started returning 500 some time ago. The CVS parameter may or may not have been the issue here. Other option is that CircleCI just fixed this on their end.