Need # define for MAx # of interruptable pins about arduino-pinchangeint HOT 4 CLOSED

This is actually a little more complicated than it sounds, and I don't think it 
will be useful.  First, the fact that there are 20 possible Arduino pins will 
rarely be used, IMHO.  You want to allocate space for the number of pins that 
you are going to utilize for your project, not waste memory allocations for 
pins you're not using. Of course, that is a choice that's up to the developer.  
But I'd venture to say that 99+% of the time MAX_INT_PINS would not be used.  
Rather, most projects using this library are going to choose a subset of the 
Arduino's pins for interrupts, so the pin count (and thus the interrupt_count 
array size) would be unique to each project.

Do you really have a project that uses *all* of the Arduino's pins for 
interrupts?  ...No LEDs, no I2C, no output of any kind?

I guess I don't understand the use case.  Perhaps you can explain in more 
detail?

I'll leave this open for another week, to allow for more discussion.  If at the 
end of that period there is nothing further I will change to "Won't fix".

You can close it now.
Not critical, just a convenience

Issue closed as per agreement.