Documentation at xiph.org has en dashes – where there should be double dash --

[H2Swine]

Probably auto-formatted from a tool that converts -- to – That could confuse people into using single dashes where they should use double. Anyway, I ran a replace on https://xiph.org/flac/documentation_tools_flac.html and https://xiph.org/flac/documentation_tools_metaflac.html and attached them.

documentation_tools.zip