Internal/private functions (their names are prefixed with an underscore) can be subject to changes without a warning and break backward compatibility unlike the public functions in general.
This makes the core developement move faster being able to change part of the code without having to take deprecation steps over multiple versions of core.
Many internal functions might not change at all but it’s an extra risk to use them in your plugin. Might be safer to copy it into your own wrapper instead.
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