Encode string values as strings

[tmair]

When a cookie is read that contains a string constisting of digits only, the call of JSON.parse will parse the String as a Number. If the number is larger than the JavaScript Number type the returned value is interpolated.

Example:

ipCookie('example', '545654545664564564564554554545');
console.log(ipCookie('example')); // 5.4565454566456454e+29

[tmair]

The problem with the proposed changes is, that it is not possible to store any value without quotes in cookies. So maybe the pull request is obsolete, but the issue with numeric strings should be mentioned in the documentation.

[ivpusic]

I will update readme. Thank you!

[that70schris]

@ivpusic, instead of changing the way cookies are set, you could add a check for isNaN(value) before trying to JSON.parse(value)