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'use strict';
const assert = require('assert');
/** * Given a value, cast it to a number, or throw an `Error` if the value * cannot be casted. `null` and `undefined` are considered valid. * * @param {Any} value * @return {Number} * @throws {Error} if `value` is not one of the allowed values * @api private */
module.exports = function castNumber(val) {  if (val == null) {    return val;  }  if (val === '') {    return null;  }
  if (typeof val === 'string' || typeof val === 'boolean') {    val = Number(val);  }
  assert.ok(!isNaN(val));  if (val instanceof Number) {    return val.valueOf();  }  if (typeof val === 'number') {    return val;  }  if (!Array.isArray(val) && typeof val.valueOf === 'function') {    return Number(val.valueOf());  }  if (val.toString && !Array.isArray(val) && val.toString() == Number(val)) {    return Number(val);  }
  assert.ok(false);};