Boolean param with default value problem

[vmalkov]

Good day!

If some method has a default Boolean parameter, the error "syntax error, unexpected ','" is thrown.

Example:

public function getMargin(int $stockId, bool $discountless=false, float $cost=0): float {....}

var_export() in buildParameterDefaultValue can fix problem:

$defaultValue .= var_export($parameter->getDefaultValue() ?? 'null',true);

return $defaultValue;