Error The merge filter only works with arrays or "Traversable", got "integer" for argument 2 when not using the merge filter

[ericmorand]

Whenever we try to spread an integer, we get this error about the merge filter.

https://twigfiddle.com/ud26jf

The merge filter only works with arrays or "Traversable", got "integer" for argument 2

Even though I suspect that internally TwigPHP depends on the merge filter to implement the spread operator, it is still wrong that the error message mentions a filter that is not used in the template.

The error message should be related to the code actually present and should be something like 5 is not iterable or 5 is neither an array nor a "Traversable".