NumScript max operator doesn't work correctly when source account has negative balance

[edwardmp]

Describe the bug
When using the max operator in NumScript, it doesn't actually take anything from the source account if the balance is negative, even though I use allowing unbounded overdraft.

To Reproduce
Steps to reproduce the behavior:

send [EUR/2 20] (
  source = @somewhere allowing unbounded overdraft
  destination = @world
)

send [EUR/2 100] (
  source = {
    # Due to above @somewhere has a negative balance of -20
    max [EUR/2 10] from @somewhere allowing unbounded overdraft
    @somewhere_else allowing unbounded overdraft
  }

  destination = @final_destination
)

Expected behavior
I expect that it will take 10 from @somewhere and 90 from @somewhere_else.
But I observe that 100 is taken from @somewhere

Environment (please complete the following information):

• Numary Version v1.10.14

[flemzord]

Thanks for the bug report! We're looking into reproducing and fixing asap on our end!

[edwardmp]

Hey @flemzord

Thanks! I actually just discovered that the negative balance is not the culprit.
Even if @somewhere has a positive balance it happens. So likely it's the combination of max and allowing unbounded overdraft that is the issue.

With other words, this example suffices to reproduce as well:

send [EUR/2 2000] (
  source = @world
  destination = @somewhere
)

send [EUR/2 100] (
  source = {
    max [EUR/2 10] from @somewhere allowing unbounded overdraft
    @somewhere_else allowing unbounded overdraft
  }

  destination = @final_destination
)

Changing max [EUR/2 10] from @somewhere allowing unbounded overdraft to max [EUR/2 10] from @somewhere solves the issue, but is obviously not necessarily what you want.