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Don't write db if _default is an empty Table.
If there are no documents in the _default table, TinyDB will write (and thus, re-serialize) the entire database.
This is because bool({}) == False, although the table does exist.
I have a JSON file under version control, which doesn't use the default table. Recently, I noticed that the file changes although I didn't change any document within the database.
Apparently, TinyDB.init reads the default table, which is empty in my case. An empty document evaluates to False in a boolean context, and TinyDB will write a new, empty table, effectively re-serializing the database on read.