--future-deprecation is undocumented

[bbrk24]

https://sass-lang.com/documentation/cli/dart-sass/ Explains --fatal-deprecation but not --future-deprecation. It's not obvious to me what should be a valid use of the --future-deprecation flag and I haven't gotten it to not give me an error.

For some context, I had been passing the current Sass version to --fatal-deprecation to make all deprecations errors, but the changelog makes it seem like that will no longer work in 1.74, unless I also add a --future-deprecation flag.

[nex3]

--future-deprecation opts you into new deprecations that haven't yet been enabled by default. Currently, the only such deprecation available is import, which deprecates the @import rule.

You can safely continue using --fatal-deprecation with a version number without using --future-deprecation.

[jathak]

Fixed by #1017.