function _randomIntMatrix (size, min, max) {
    const res = randomMatrix(size.valueOf(), () => _randomInt(min, max))
    return isMatrix(size) ? size.create(res, 'number') : res
  }
Return a random integer number larger or equal to `min` and smaller than `max`
using a uniform distribution.

Syntax:

    math.randomInt()                // generate either 0 or 1, randomly
    math.randomInt(max)             // generate a random integer between 0 and max
    math.randomInt(min, max)        // generate a random integer between min and max
    math.randomInt(size)            // generate a matrix with random integer between 0 and 1
    math.randomInt(size, max)       // generate a matrix with random integer between 0 and max
    math.randomInt(size, min, max)  // generate a matrix with random integer between min and max

Examples:

    math.randomInt(100)    // returns a random integer between 0 and 100
    math.randomInt(30, 40) // returns a random integer between 30 and 40
    math.randomInt([2, 3]) // returns a 2x3 matrix with random integers between 0 and 1

See also:

    random, pickRandom

@param {Array | Matrix} [size] If provided, an array or matrix with given
                               size and filled with random values is returned
@param {number} [min]  Minimum boundary for the random value, included
@param {number} [max]  Maximum boundary for the random value, excluded
@return {number | Array | Matrix} A random integer value