[ChatSetAttr] Is there a way of throwing an error when !modattr goes to a negative integer?

So the issue is that I'm setting up a Spell Copy script, which works fine !modattr --charid -LnNCU7y_Ek8OVhQ1d9X --repeating_equipment_-LnRyvI3OpuZ5d1L1xEu_uses|-[[?{What is the level of the spell being transcribed?}*50]] --silent But it does nothing regarding a negative integer, it simply outputs it as negative. So if the character has 25 gp of transcription materials (inks, paper, etc.) and copies a 1st level spell (which costs 50gp), the result is not an error message, it results in a value of -25.  If I use !modbattr, again it throws no error, just results in value 0. Is there something that could be added, such as --no-negative-value , that would throw an error if the result would be a negative number using !modattr?

Not built-in, no. You could hack it in using --evaluate...

Ok.  Wish there was but I just converted it to the uses column instead on Shaped's Character Sheet.  Trying to use more than the amount of uses will stop the transcription allows.  I just hate how you can -and have to- see the query string in the Per Use in edit mode: [[?{What is the level of the spell being transcribed?|1|2|3|4|5|6|7|8|9}*50]]

Also, I don't want players using --evaluate, and this is on a player's sheet.