Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
InternalsArea: what it touches
Internal ChangesKind: in v2.1.234,
Internal ChangesSection of the release
What
Names used as storage keys are now refused if any path segment is a dot followed by sixteen hex characters and .aside, joining the existing bans on NUL bytes, slashes and dot-only names. The transcript-file listing reuses the same check.
Evidence
/^\.[0-9a-f]{16}\.aside$/
Strings lifted out of the shipped bundle, so the claim above can be checked against them.