Mise activation issue in nushell from hooks

[cfbender]

I noticed my mise activation wasn't working, and it looks like this was the issue:

 13 │   let old_hooks = $old_config | get $field --ignore-errors | default []
 14 │   $env.config = ($old_config | upsert $field ($old_hooks ++ $new_hook))
    ·                                               ─────┬──── ─┬ ────┬────
    ·                                                    │      │     ╰── record<condition: closure, code: closure>
    ·                                                    │      ╰── type mismatch for operator
    ·                                                    ╰── list<closure>
 15 │ }
    ╰────

I solved this by wrapping the $new_hook variable in a list: