Combination class (Condorcet >= 3.4) is broken with big int about condorcet HOT 3 CLOSED

https://stackoverflow.com/questions/211345/working-with-large-numbers-in-php

php > var_dump($a = 12033222880 * 12033222880);                                                                                                                                                                                                
float(1.447984528797555E+20)
php > var_dump((int) $a);                                                                                                                                                                                                                      
int(-2775499709920919552)

from condorcet.

The following solutions are possible:

1. Use this new dependency https://github.com/brick/math and use BigInt
   a. Pros: Does the job. Use BCMath PHP extension if available or in pure PHP. Should work with actual PHAR builder (Github action)
   b. Cons: First necessary external PHP library. __CondorcetAutoload.php installation method will not work anymore.

2. Same as above, but with a Condorcet fallback with limitations (detect it an throw exception)

3. Use directly BCMaths PHP extension
   a. Pros: Does the job.
   b. Cons: Extension not often available by default

4. Same idea that 2. but with BCMaths instead brick/math

5. Just detect the PHP limitation (check if int is becoming a float, or then a negative number, before returning it) and throw Exception. This will have no concrete voting method impacts, but the class Permutations and Combination will be limited which is a pity on the abstract side.
   a. Pros: No impact
   b. Cons: Not elegant

from condorcet.

Solution 2 ==> Merged

from condorcet.