[API] Error requesting a single field


The following request works as expected:


But this one fails with status 422 Unprocessable Entity:


The response is:

{"error":{"type":"INVALID_REQUEST_UNKNOWN","message":"Invalid request: parameter validation failed. Check your request data."}}


Also, what does “array of strings” actually mean in the context of an URL-encoded parameter?


Funny thing, repeating the field works:


Clearly there’s a problem with the “array” when it has only one element.