NSTextShowsControlCharacters seems to be broken in Sierra

In dotfiles/.macos you might want to comment this one out, because it seems to be messed up in Sierra (at least).

Create a file containing ^A^A^A^A

defaults write NSGlobalDomain NSTextShowsControlCharacters -bool true

Open file in TextEdit, displays ^A^A^A^A^A^A^A^A^A^A

Multiple sequential control characters inside non-control text are similarly messed up, and editing the file corrupts the display.

Now to figure out how to open a bug report with Apple. :)

Open dotfiles/.macos and locate the NSTextShowsControlCharacters setting represented by the shown defaults command. Reproduce the behavior in TextEdit with sequential control characters if possible, then comment out that setting; done means the problematic Sierra-specific preference is no longer enabled by the file.

Written by the indexing model from the issue text.