[token-mod] weird decimal change when substracting 1 from a bar value with preexisting decimals

I don't know if this is a known occurence, but somehow, when a bar value has decimals, substracting 1 from it with tokenmod tends to substract 0.9000000000000008 (or even 1.11111) or something of that order. Case in point, this example in my image below( on the image,  I copy-pasted bar1's value into the name field, cause it doesn't fit entirely into the bar1 field ): From 2.2, when substracting 1 via the macro, the bar becomes 1.2000000000000002.  The macro I use is simply: !token-mod --set bar1_value|-1 (although the name of the macro is '⛉--1', beginning with a miscelaneaous unicode character, I don't know if that might cause issues, and the phenomenon happens regardless of wich bar is targetted) So that's odd. I'm running Cyberpunk Red, for those who are curious. And I use the decimals to indicate spare ammo and # of dmg dice, I also use the green and blue bar max values as macro storage for attack and initiative (i then just call for bax_max in chat with a macro button) , in order to keep all info on the token itself, thus not needing a linked charsheet.

Hi Yui V., You can solve the extreme decimal places using rounding.  If you want it rounded to two decimal places you can do the following:  [[round(X*100)/100]] Where X is the value you want to round off.  Here is how you'd apply it to your situation:  !token-mod --set bar1_value|[[round((@{selected|bar1}-1)*100)/100]] If you want more decimal places, increase the number of zeros. If you want fewer decimal places, decrease the number of zeros. 

Thanks ! That gets around the problem. I've check and Token-mod is actually not the only API that does this. Chatsetattr seemes to have the same problem, must be a thing about how bars are interacted with by the API?

It likely has to do more with how the attributes are defined, and how computers handle floating point math. Typically a programmer can account for this by rounding results (as Gauss has done above), but you have multiple systems interacting here (Character sheet and mod script.)