In the "Other details" section, the latest draft says:
> The $nfx$ and $bracket-apply symbols are unhygienic, [...]

You missed the '$' at the end of '$bracket-apply$'.

Also, you might consider correcting this typo I made in my email:

> "apart from the fact that $nfx$ et are meant to be defined by the
> user, [...]

s/et are meant/etc are meant/

    Thanks,
      Mark