Does my list of binary_sensors have any that are on

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I was going to suggest using bool to determine truthy/falsy. However, it doesn’t support negative values or single letters like Y and N.

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{% set x = ['ON', 'on', 'On', 'TRUE', 'True', 'true', true,
  'OFF', 'off', 'Off', 'FALSE', 'False', 'false', false] %}

{{ x | map('bool') | list }}

{{ -7 | bool }}