|  |  4.2.3 bigint operations 
 
+addition
-negation or subtraction
*multiplication
divinteger division (omitting the remainder >= 0)
mod,%integer modulo (the remainder of the division div)^,**exponentiation (exponent must be non-negative)
<,>,<=,>=,==,<>comparators
 
Example:
 |  | bigint(5)*2, bigint(2)^100-10;
==> 10 1267650600228229401496703205366
bigint(-5) div 2, bigint(-5) mod 2;
==> -3 1
 | 
 
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