why are custom headers sometimes headers and sometimes parameters?

[matthuszagh]

(org-element-at-point) returns a nested list where sometimes a source block's headers are :headers and sometimes they're :parameters. What logic controls this? Is this intentional behavior or a bug?

To accommodate this behavior, I've defined header matching as:

(defun mh//header-match (elem match)
    "Returns `t' if MATCH is explicitly a header of ELEM.
Explicit in this context means that it's literally written in the
file rather than being provided as a default header argument."
    (let* ((elem (org-element-at-point))
           (elem-header (append (list (org-element-property :parameters elem))
                                (org-element-property :header elem)))
           (matchp nil))
      (dolist (elt elem-header)
        (if (string-match match elt)
            (setq matchp t)))
      matchp))