Thanks to Ivan (2DEngine.com), who wrote this and convinced me it was
a good idea.
This change in writing tables results in up to 20% faster
serialization in common cases, and doesn't significantly affect
performance in contrived cases.
Now only a single variable is used (_).
What effect does this have on the file size and runtime? I have no idea.
I don't think it'll be *that* much, though.
