JSFiddle - React, Tailwind, and code Playground

HTML

<div id="foo" data-myinline="1.410"></div>

JavaScript

var foo = $('#foo');
foo.data('mynumber', 1.410);
foo.data('mystring', '1.410');
console.log(typeof foo.data('mynumber'), foo.data('mynumber'));
console.log(typeof foo.data('mystring'), foo.data('mystring'));
console.log(typeof foo.data('myinline'), foo.data('myinline'));
console.log(typeof foo.attr('data-myinline'), foo.attr('data-myinline'));

foo.data('myinline', '1.410');
console.log(typeof foo.data('myinline'), foo.data('myinline'));