isX() quality of life functions

[JamesCarlyleClarke]

Hi there,
Maybe I'm missing something, but could we get some quality of life functions?
For example, you already have isFinite() and isNaN(); to avoid having to create a Decimal for comparison sake, or relying on internal structures within the library that might change, could we have the equivalents of:

From break_infinity.js

isNegativeInfinity()   - https://patashu.github.io/break_infinity.js/classes/default.html#isNegativeInfinity
isPositiveInfinity()   - https://patashu.github.io/break_infinity.js/classes/default.html#isPositiveInfinity

From decimal.js

isNegative() or isNeg()   - https://mikemcl.github.io/decimal.js/#isNeg
isPositive() or isPos()   - https://mikemcl.github.io/decimal.js/#isPos
isZero()   - https://mikemcl.github.io/decimal.js/#isZero

You could also have isInteger(), isMax(), isMin(), etc.

Hope that helps, thanks for a great library.

Additional:
I know/believe we could do something like this isNegative():

function isNegative(decimal) {
    return decimal.sign === -1;
}

or the shorter

if (decimal.sign === -1) {
}

I just feel that a set of standard helper functions would be great, and would help separate our code from internal structures and representations.