A distinct string type that is tainted, see taint mode for details. It is an alias for string if the taint mode is not turned on.
and point to a section in the manual https://nim-lang.org/docs/manual.html#taint-mode that doesn't exist. Can someone point me to a definition of taint mode and how it's used?
That part of the manual is now in the experimental document here:
https://nim-lang.github.io/Nim/manual_experimental.html#taint-mode