import { BigNumber } from "https://deno.land/x/web3@v0.11.1/types/bignumber.d.ts";
Returns a BigNumber whose value is the value of this BigNumber rounded to an integer using
rounding mode rm.
If rm is omitted, or is null or undefined, ROUNDING_MODE is used.
Throws if rm is invalid.
x = new BigNumber(123.456)
x.integerValue() // '123'
x.integerValue(BigNumber.ROUND_CEIL) // '124'
y = new BigNumber(-12.7)
y.integerValue() // '-13'
x.integerValue(BigNumber.ROUND_DOWN) // '-12'