[trinix912]

It depends on the local norms. Where I live, 1,004 is decimal, 1 004 or 1'004 is 1004 which makes it even more clear than the en-US default. That is, the 1.004 variant is never used, and if it is, it is assumed to be a decimal (misspelling) of 1,004.

[Waterluvian]

So is there no such thing as "100,000,004" and having no idea if that's a decimal or a thousands separator?

[mantas]

Not sure where OP is from, but in my whereabouts „100,000,004“ wouldn’t show up in the wild. We use spaces to separate if really needed.

[Waterluvian]

Ah makes sense. In Canada we were taught to use spaces to separate, and decimals for decimals. But being stuck so close to the US we end up with a mess of everything.

[bryanrasmussen]

In Denmark for example the decimal and comma are reversed in meaning, so you would not have a Danish 100,000,004 because that is an obvious non-Danish number.