filename unescaping with non-ascii characters
bug: can't open files with non-ascii characters and whitespace in their names
related: none
code: input
touch 'fïle 1.txt'
cat fïle\ 1.txtexpect: the file contents
result: cat: 'fïle\ 1.txt': No such file or directory
version: df993477
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