Automatic install makes zsh to hang forever

Hello,

Great tool! I have had a great pleasure to use it to create my own autocomplete stuff :-)

I have used the `.setupShellInitFile()` function to automatically setup the shell autocompletion. However when I do so and run `source ~/.zshrc`, it hangs forever. I have to `kill -9` the hanging process.

The added line in the `.zshrc` files is the following:

```
# .zshrc
. <(app --completion)
```

When I turn it into the following one, it does not hang and autocompletion works:

```
eval $(app --completion)
```

I am unsure about this issue.
Do you have an idea?

Start with `.setupShellInitFile()` and reproduce the problem by sourcing the generated `.zshrc` line `. <(app --completion)`. Compare its behavior with `eval $(app --completion)` and trace the completion command's output and process lifetime; done means sourcing `.zshrc` no longer hangs and autocompletion still works.

Written by the indexing model from the issue text.