Comment by aleksi

1) The idea is that your library should accept the slog logger and use it. The caller would create a logger with a handler that defines how log messages are handled. But there are problems with supported types; see my other comments.

2) It is improved in 1.25. See https://github.com/golang/go/issues/59928 and https://pkg.go.dev/testing#T.Output. Now it is possible to update slogt to provide correct callsite – the stack depth should be the same.