src/LightSaml/Model/Protocol/AuthnRequest.php
public function setForceAuthn($forceAuthn)
    {
        $this->forceAuthn = 0 == strcasecmp($forceAuthn, 'true') || true === $forceAuthn || 1 == $forceAuthn;

        return $this;
    }
public function setForceAuthn($forceAuthn)
    {
        $this->forceAuthn = 0 == strcasecmp($forceAuthn, 'true') || true === $forceAuthn || 1 == $forceAuthn;

        return $this;
    }
@param bool|null $forceAuthn

@return AuthnRequest