We don't have to do this in this PR, but I do wonder if this is all cleaner and more easily done with this pattern:

const state = reactive({
  holder: '',
  ...
});

And then just state.holder etc. throughout.

Originally posted by @dlongley in #105 (comment)

See also that computed properties can be used with a reactive object. (See: https://stackoverflow.com/a/65977617).