Had anyone thought that it might be very useful to have a NumberFormat.prototype.parse which does the opposite of format?

It can be very useful to know how a certain formatted number can be parsed since in different locales different symbols (such as decimal marks) can have different meaning.

So for example:

new Intl.NumberFormat('ja-JP', { style: 'currency', currency: 'JPY' }).format(123456.789)
// '￥123,457'

new Intl.NumberFormat('ja-JP').parse('￥123,457')
// would return something like { currency: 'JPY', value: 123457 }