I have added a wiki page describing serializer: wiki.vcmi.eu/index.php?title=Serialization
It may be a little rough because I didn’t have time to properly proofread it, but I believe it properly documents all the relevant features of Serializer. If you spot a bug or if you think you can improve description, feel free to do it. [it’s wiki!]
If something is not clear or if there remain parts that should be described, please let me know in this thread, and I’ll try to improve the description.