A proper number is 123.456,78 in large parts of Europe. If I can't put that into your number control when my browser locale is set to Dutch, your custom number input has failed as much at the broken input we're talking about.
It's not just the specific separators, of course; in India such a number is often written like 1,23,456.78 for example, grouping numbers entirely different. Don't assume everyone is American.
A proper number is 123.456,78 in large parts of Europe. If I can't put that into your number control when my browser locale is set to Dutch, your custom number input has failed as much at the broken input we're talking about.
It's not just the specific separators, of course; in India such a number is often written like 1,23,456.78 for example, grouping numbers entirely different. Don't assume everyone is American.