The following documents are available:
There is a mailing list for programmer-level discussions of SP. Mail subscription requests email@example.com. Messages for the list should go to firstname.lastname@example.org.
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I would like to hear about any bugs you find in SP. When reporting a bug, please always include a complete self-contained file that will enable me to reproduce the bug. I am also interested in receiving suggestions for improvements to SP no matter how small.