### 4.1.3 bigint operations

`+`
  addition
`-`
  negation or subtraction
`*`
  multiplication
`div`
  integer 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;
    ==> -2 -1

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