isString (value) {
    return (
      typeof value === 'string' ||
      (value && typeof value === 'object' && toStr(value) === STRING_TAG)
    )
  }
Return whether the provided value is a string.

@example
import { utils } from 'js-data';
console.log(utils.isString('')); // true
console.log(utils.isString('my string')); // true
console.log(utils.isString(100)); // false
console.log(utils.isString([1,2,4])); // false

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