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Filename : coerce.js

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"use strict";

var isValue  = require("../value/is")
  , isObject = require("../object/is");

var objectToString = Object.prototype.toString;

module.exports = function (value) {
	if (!isValue(value)) return null;
	if (isObject(value)) {
		// Reject Object.prototype.toString coercion
		var valueToString = value.toString;
		if (typeof valueToString !== "function") return null;
		if (valueToString === objectToString) return null;
		// Note: It can be object coming from other realm, still as there's no ES3 and CSP compliant
		// way to resolve its realm's Object.prototype.toString it's left as not addressed edge case
	}
	try {
		return "" + value; // Ensure implicit coercion
	} catch (error) {
		return null;
	}
};