Streaming multiple function calls gives an error

[ultronozm]

Executing the following code (replacing :key with whatever)

(let* ((provider (make-llm-openai
                  :key (exec-path-from-shell-getenv "OPENAI_API_KEY")
                  :chat-model "gpt-4o"))
       (prompt
        (llm-make-chat-prompt
         "Compute 3+5 and 7+9."
         :temperature 0.1
         :functions
         (list (make-llm-function-call
                :function (lambda (a b)
                            (+ a b))
                :name "add"
                :description "Sums two numbers."
                :args (list (make-llm-function-arg
                             :name "a"
                             :description "A number."
                             :type 'integer
                             :required t)
                            (make-llm-function-arg
                             :name "b"
                             :description "A number."
                             :type 'integer
                             :required t)))))))
  (llm-chat-streaming provider prompt #'ignore #'ignore #'ignore))

yields a complicated args-out-of-range error, ultimately triggered by the function llm-provider-collect-streaming-function-data in llm-openai.el, in the block (setf (llm-provider-utils-function-call-id (aref cvec index)) id), where index is 1 but cvec has length 1. I haven't yet tried to understand exactly why this is happening.

The error doesn't happen if one asks for just one arithmetic operation (e.g., just "3+5").