Purpose: List and discuss technical decisions with regard to the official list extension in particular.
AK: Proposal: Use namespaces, the namespace is ::list.
AK: File organization: One file, more than one file ?
AK: Definitely use the package mechanism to simplify usage of the extension.
AK: Comments and coding: Follow the published styleguide. Makes extraction of documentation harder, but not impossible.
RSeeger: Have both an pure Tcl version, and a compiled extension version. If people wish to compile, they can gain the speed of the binary version. If not (don't have access to a compiler, not allowed to, etc), they can use the pure Tcl version, at the cost of speed.