Checkboxes - Default value with space

[AtmoFX]

Bug description

Options in Checkboxes fields may have a space in their keys.

But it is not possible to type a space into the Default value field.
The only way to bypass this restriction is to paste the values into the field, which is how I managed to make the screenshot below. Saving is possible after doing so.

On a related note, there is no auto-completion for the default values field, meaning a non-existing key could be typed in there. I am unsure what functionality that allows.

How to reproduce

1. Add a checkboxes field in any blueprint
2. Add a key/label pair where the key has a space inside it (this step does not matter but if you do it, at least, you will rule out the possibility the space wasn't accepted because it does not match an existing key).
3. Try to type a default value with a space inside it

Logs

Environment

Environment
Laravel Version: 12.53.0
PHP Version: 8.3.6
Composer Version: 2.9.2
Environment: local
Debug Mode: ENABLED
Maintenance Mode: OFF
Timezone: UTC
Locale: en

Cache
Config: NOT CACHED
Events: NOT CACHED
Routes: NOT CACHED
Views: CACHED

Drivers
Broadcasting: log
Cache: file
Database: sqlite
Logs: stack / single
Mail: log
Queue: sync
Session: file

Storage
public/storage: NOT LINKED

Livewire
Livewire: v4.2.1

Statamic
Addons: 3
Sites: 1
Stache Watcher: Enabled (auto)
Static Caching: Disabled
Version: 6.8.0 Solo

Statamic Addons
allyoullneed/inline-bard-components: dev-main
allyoullneed/statamic-forms: dev-main
alt-design/alt-seo: 1.4.0

Installation

Fresh statamic/statamic site via CLI

Additional details

I tested pasting values with in a Form Blueprint and fields are correctly rendered in the form.
Test was done with a Statamic addon I will soon publish (wish me luck) but I have no reason to believe it may misbehave if using e.g. dynamic rendering of fields as values look well-formed.

I have not tested it in a collection blueprint but I suppose it works just as well.

AFAICT, default values in Radios fieldtype accept typing spaces, as they should.

[ebeauchamps]

But it is not possible to type a space into the Default value field.

You mean, the "Label (optional)" field? or the "Key" field?

[AtmoFX]

@ebeauchamps Where it is not possible is in the Default value field, i.e. the 2nd screenshot where I say I was only able to add default values with a space thanks to copy/paste, but not because I was able to press the spacebar inside that field.

The fact is: since it is possible to type a space in Key and in Label (optional), it should most likely be the same for the default values.