Inconsistent handling of quoted strings passed to `exec`

[mavit]

How should strings passed to eask exec be quoted? The behaviour seems inconsistent:

$ eask exec echo '"foo"'
Updating environment variables... done ✓
Exporting environment variables... done ✓
foo
eask exec echo '" "'
Updating environment variables... done ✓
Exporting environment variables... done ✓
" "
$ eask exec echo 'foo\ \-bar'
Updating environment variables... done ✓
Exporting environment variables... done ✓
foo\ \-bar
$ eask exec echo 'foo\-bar'
Updating environment variables... done ✓
Exporting environment variables... done ✓
foo-bar