using more then 1 character in fieldSeparator dont work

[yujichen]

when i set fieldSeparator as || it didnt give expected result

expected result name||age~||gender "ken"||10||"m"

return result name||age||gender "ken"||10||"m"|

found the issus

• row = row.slice(0, -1);

if change to below will solved the issues

• row = row.slice(0, _(this.options.fieldSeparator.length * -1));