dda seems to merge stderr with stdout

[rdesgroppes]

As of version 0.29.0, messages printed to /dev/stderr seem to be redirected to /dev/stdout:

$ dda inv command_that_prints_to_both_stream 2>/dev/null
message_printed_to_stderr
message_printed_to_stdout

If I pretend I'm in CI, the behavior changes as follows:

$ CI=true dda inv command_that_prints_to_both_stream 2>/dev/null

message_printed_to_stdout

(with an extra newline)

I would expect the following output, whether in CI or not:

$ dda inv command_that_prints_to_both_stream 2>/dev/null
message_printed_to_stdout

$ CI=true dda inv command_that_prints_to_both_stream 2>/dev/null
message_printed_to_stdout