Twig Components / Methods / bool

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bool is a Twig test to to test a value for being a bool (like is_bool in PHP).

It uses the mentioned PHP functions / comparisons internally, so you have the same behavior as in PHP.

{% if somevar is boolean %} {# no equivalent in Twig %} #}
{% endif %}
{% if somevar is bool %} {# same as boolean test above, alternate way to write it %} #}
{% endif %}

Source: Squirrelphp