Is_state_attr(...) with none argument to test

@stezak wrote:

Why do the following two comparisons NOT return the same result?

{% if state_attr('climate.home_2', 'preset_mode') == none %}A{% else %}B{% endif %}

{% if is_state_attr('climate.home_2', 'preset_mode', none) %}A{% else %}B{% endif %}

Templating result:

A

B

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