src/Shared/Extension/ExtensionAwareTrait.php
public function addExtension(
        ExtensionInterface $ext,
        /*# bool */ $forceOverride = false
    ) {
        foreach ($ext->methodsAvailable() as $method) {
            if (isset($this->extension_methods[$method]) &&
                !$forceOverride) {
                throw new LogicException(
                    Message::get(Message::MSG_EXTENSION_METHOD, $method),
                    Message::MSG_EXTENSION_METHOD
                );
            }
            $this->extension_methods[$method] = $ext;
        }
        $ext->boot($this);
        return $this;
    }
public function addExtension(
        ExtensionInterface $ext,
        /*# bool */ $forceOverride = false
    ) {
        foreach ($ext->methodsAvailable() as $method) {
            if (isset($this->extension_methods[$method]) &&
                !$forceOverride) {
                throw new LogicException(
                    Message::get(Message::MSG_EXTENSION_METHOD, $method),
                    Message::MSG_EXTENSION_METHOD
                );
            }
            $this->extension_methods[$method] = $ext;
        }
        $ext->boot($this);
        return $this;
    }
{@inheritDoc}