Possible conflict in definitions for uncheckable property

[DanielSwain]

This page has the following definition for uncheckable:
uncheckable - auto - Setting to true/false will determine whether an input will allow no selection. Auto will set disallow this behavior only for radio boxes

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This page has the following seemingly conflicting explanation:

One-Way Choices
To make a user able to check a box, but unable to uncheck it, use the uncheckable setting.

These seem like conflicting definitions for uncheckable. Perhaps more explanation in the docs would clarify this?