Description:
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An email with an invalid character ' is filtered as a valid email.

Test script:
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$email = "hello'@world.it";
$sanitized_email = filter_var($email, FILTER_SANITIZE_EMAIL);
$this->assertEquals($email,$sanitized_email,"The email should not be valid!");

Expected result:
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The email should not pass validation.

Actual result:
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The email is returned from the filter_var function.