Under the hood
Useful1 Signal2
Debug log buffering handles structured entries, letting debug output go to the storage backend.
What's wrong with this entry?
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What
The buffered writer behind debug logging batches items measured by their own content length rather than concatenating strings, with a wrapper preserving the old joined-string behaviour. This is what allows debug output to be appended to the new storage backend rather than straight to a file.
Evidence
writeBatch
Strings lifted out of the shipped bundle, so the claim above can be checked against them.