DBD::Oracle use_drcp and connection class

Hello,

after looking at the sources of DBD::Oracle I am somewhat confused. OCI
offers Session pooling and Connection pooling. "DRCP" is abbreviation
for "connection pooling", but DBD::Oracle offers "session pooling",
which is not exactly the same.

Connected to this is the question about "connection class"
(ora_drcp_class). This parameter is necessary for "connection pooling",
but I couldn't find anything about it in the documentation for "session pooling".
Can someone please clarify this? So far it appears, that this parameter
is simply ignored in "session pooling".

Thank you.