src/Field.php
private function guardDefault($default)
    {
        if ($this->isASingleValue()) {
            $this->guardValue($default);
            return;
        }

        Assertion::nullOrIsArray($default, sprintf('Field [%s] default must be an array.', $this->name));
        if (null === $default) {
            return;
        }

        if ($this->isAMap()) {
            Assertion::true(
                ArrayUtils::isAssoc($default),
                sprintf('Field [%s] default must be an associative array.', $this->name)
            );
        }

        foreach ($default as $k => $v) {
            Assertion::notNull($v, sprintf('Field [%s] default for key [%s] cannot be null.', $this->name, $k));
            $this->guardValue($v);
        }
    }
private function guardDefault($default)
    {
        if ($this->isASingleValue()) {
            $this->guardValue($default);
            return;
        }

        Assertion::nullOrIsArray($default, sprintf('Field [%s] default must be an array.', $this->name));
        if (null === $default) {
            return;
        }

        if ($this->isAMap()) {
            Assertion::true(
                ArrayUtils::isAssoc($default),
                sprintf('Field [%s] default must be an associative array.', $this->name)
            );
        }

        foreach ($default as $k => $v) {
            Assertion::notNull($v, sprintf('Field [%s] default for key [%s] cannot be null.', $this->name, $k));
            $this->guardValue($v);
        }
    }
@param mixed $default

@throws AssertionFailed
@throws \Exception