Yield id, content_length even if indeterminate length
Yield id, content_length even if indeterminate length

Turns out this could be useful even if it's unsupported.

Includes documentation.

astockwell/ruby-net-ldap,cloudvolumes/ruby-net-ldap,astockwell/ruby-net-ldap,cloudvolumes/ruby-net-ldap,bkeepers/ruby-net-ldap,bkeepers/ruby-net-ldap,javanthropus/ruby-net-ldap,javanthropus/ruby-net-ldap