#PSA: if you've been using a custom `rem()` function in #SASS to convert px to rem, version 1.65 is likely to break your code, as it introduces the official #CSS `rem()` function, which returns the remainder of a division.
There are issues open about this, but it seems intended behaviour and the official solution seems to be to rename the custom function to something like `toRem`, which yes, is sadly more annoying to type...
*Update*: the change was reverted. Version 1.66 now no longer breaks custom `rem()` functions—for now. Custom function names overlapping with CSS math functions have been deprecated and will stop working eventually.
For context see this comment on GitHub: https://github.com/sass/sass/issues/3504#issuecomment-1682737824