selectattr and rejectattr require the third argument to be a collection #1227

The following works in Jinja2:

>>> import jinja2
>>> env = jinja2.Environment()
>>> template = env.from_string("{{ [('action', 'down_single'), ('event_type', 'down_single')] | rejectattr(0, 'in', 'name,event_type') | list }}")
>>> template.render()
"[('action', 'down_single')]"

But with Jinjava, I get com.hubspot.jinjava.interpret.FatalTemplateErrorsException: Invalid argument in 'in': 1st argument with value 'name,event_type' must be iterable

I couldn't find the source in Jinja, but I presume somewhere it implicitly turns non-iterables into a list.