minus operation in parenthesis return Invalid arithmetical expression

[matteo-cristino]

In the statement When I create the result of '' when using a minus sign as first operation inside a parenthesis zenroom interprets it as a invalid mathematical expression.

Given nothing

When I set '2' to '2' as 'integer'
When I set '3' to '3' as 'integer'

When I create the result of '(3 - 2)'

Then print the 'result'

results in

[!] Invalid arithmetical expression