public TypedDataInterface::setValue($value, $notify = TRUE)
Sets the data value.
mixed|null $value: The value to set in the format as documented for the data type or NULL to unset the data value.
bool $notify: (optional) Whether to notify the parent object of the change. Defaults to TRUE. If a property is updated from a parent object, set it to FALSE to avoid being notified again.
\InvalidArgumentException If the value input is inappropriate.
\Drupal\Core\TypedData\Exception\ReadOnlyException If the data is read-only.
public function setValue($value, $notify = TRUE);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!TypedData!TypedDataInterface.php/function/TypedDataInterface::setValue/8.1.x