Comment 5 for bug 1492568

It is precisely this kind of combination that leads to all kinds of inconsistency across systems within the country, or worse, users defaulting to whatever English the machine was set up for and using oddball date and time formats, and using inappropriate currency and decimal setups, leading to confusion.

There is no satisfactory combination of existing locales (eg, en_US language with id_ID region) that accommodate English language and region settings. In the case of decimals, for example, the convention in Indonesian English is to use periods and not commas, as is the standard for Indonesian language.