[curlopt_buffersize] is used together with [curl->set]. The parameter expected by [curl->set] is an integer that will be used to indicate the your preferred size (in bytes) for the receive buffer used by [curl]. This is just a request to the library, the actual buffer size used may be different and completely disregard your request.
Use the [curlopt_buffersize] method.
local(c = curl('www.example.com/login)) #c->set(curlopt_buffersize, 8196) #c->result
Please note that periodically LassoSoft will go through the notes and may incorporate information from them into the documentation. Any submission here gives LassoSoft a non-exclusive license and will be made available in various formats to the Lasso community.