Cannot create masked CI/CD project variable with API

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Hi there,

following the documentation on https://docs.gitlab.com/ee/api/project_level_variables.html#create-a-variable, I tried creating some project level CI/CD variables via curl. Unfortunately, the API does not accept the masked parameter as it should (or the documentation does not clearly state how it should be formatted)

I successfully created a plain variable with the following command curl -X POST -H "PRIVATE-TOKEN:MY_TOKEN" "https://www.gitlab.com/api/v4/projects/MY_PROJECT_ID/variables" -F "key=TESTING_KEY" -F "value=TESTING something"

However it throws an error when using the masked param.

curl -X POST \
    -H "PRIVATE-TOKEN:MY_TOKEN" \
    "https://www.gitlab.com/api/v4/projects/MY_PROJECT_ID/variables" \
    -F "key=MASKED_TESTING_KEY" -F "value=TESTING masked as true" \
    -F "masked=true"

returns {"message":{"value":["is invalid"]}} Yet when you set masked=false, the variable is created as expected.

What exactly is the problem here? The documentation clearly states that the it's a boolean (I also tried TRUE, 1, but none worked)

Any help would be greatly appreciated!