isNumber (value) {
    const type = typeof value
    return (
      type === 'number' ||
      (value && type === 'object' && toStr(value) === NUMBER_TAG)
    )
  }
Return whether the provided value is a number.

@example
import { utils } from 'js-data';
const a = 1;
const b = -1.25;
const c = '1';
console.log(utils.isNumber(a)); // true
console.log(utils.isNumber(b)); // true
console.log(utils.isNumber(c)); // false

@method utils.isNumber
@param {*} value The value to test.
@returns {boolean} Whether the provided value is a number.
@since 3.0.0