filename unescaping with non-ascii characters
bug: can't open files with non-ascii characters and whitespace in their names
touch 'fïle 1.txt' cat fïle\ 1.txt
expect: the file contents
cat: 'fïle\ 1.txt': No such file or directory
context: using ion as a interactive shell, the escaping comes from tab-completion, using single quotes instead of
\ works just fine.
behavior of bash/dash/zsh/fish/oil: open the file