I have a YML file that I parse, which has the following syntax for an empty array:

some_field: [ ]

Upon dumping the same YML file, and not adjusting some_field, the value is dumped as:

some_field: { }

My understanding is that the { } syntax is intended for objects, not arrays. As such, I isolated the code found in the dumpArray function which was introducing this behavior:

https://github.com/symfony/yaml/blob/2.8/Inline.php#L191

return sprintf('{ %s }', implode(', ', $output));

.... adjusted to ....

return sprintf('[ %s ]', implode(', ', $output));

... fixes this issue.

Is there a reason why this is using the object-based syntax and not the array syntax?