The a.Key == "" guard warrants explanation. The slog contract specifies ignoring attributes where both key and value represent zero values, testable via a.Equal(slog.Attr{}). However, Value.Equal panics when both sides contain identical non-comparable types (two slices stored via slog.Any, for instance). Checking a.Key == "" provides broader coverage: captures all empty-key attributes, not merely zero-value ones. Practically, standard library handlers implement similar broader filtering, avoiding panic surfaces in production code.
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