Trying to negate a value fails unexpectedly

[bluenote10]

I'm completely new to tera so I may be doing something stupid. I've narrowed the reproduction down to having this macro:

{% macro try_to_negate_value(value) %}
  {{ -value }}
{% endmacro try_to_negate_value %}

and using it like this:

{% import "my_macros" as macros %}
{{ macros::try_to_negate_value(value=42) }}

This panics with

  --> 33:6
   |
33 |   {{ -value }}
   |      ^---
   |
   = expected a value that can be negated or an array of values

When removing the minus sign everything works fine, but I don't understand why 42 cannot be negated. A floating point value doesn't work either.