React warning for key in jt

[AlexMost]

Example:

const el = <br/>;
const = jt`text ${el} text`

React will warn that br should have a unique key.

Possible solutions:

1. Add keys if not exist for nested elements.
2. Wrap jt content in the <React.Fragment/>

[dimaqq]

IMO fragment makes most sense because the number of elements is constant.