Content length check fails in browser (but not in Node) when content contains emojis

[jhsware]

Issue related to this:

    // Characters such as emojis are handled differently by Javascript. They are
    // called an astral symbol and are respresented by a surrogate pair, ie two chars.
    // Some references:
    // https://mathiasbynens.be/notes/javascript-unicode
    // https://en.wikipedia.org/wiki/Plane_(Unicode)#Basic_Multilingual_Plane