--flac CLI option results in lossy audio file

Using the --flac command line option results in the returned file to be encoded with the lossy AAC codec in an M4A container instead of FLAC. This is a little misleading.

$ scdl --flac --auth-token <AUTH TOKEN> -l https://soundcloud.com/ctoonlink/word-shop
Soundcloud Downloader
Found a track
Downloading Word Shop
Creating the ffmpeg pipe...
Encoding..
100%|██████████████████████████████████████████████████████████████████████████████████████████████████████████████| 178.005/178.005 [00:01<00:00, 98.31s/s]
Applying metadata...
Word Shop.m4a Downloaded.

File info taken from foobar2000;

Items Selected: 1
Duration: 2:58.005 (8 544 256 samples)
Sample rate: 48000 Hz
Channels: 2
Bitrate: 255 kbps
Codec: AAC
Codec profile: AAC LC
Encoding: lossy

This was done with a SoundCloud Go+ subscription. I've additionally set my SoundCloud account to prefer high-quality audio, but to no avail.

scdl-org / scdl

--flac CLI option results in lossy audio file #508