default FORMAT locale: en_US

== %,.2f of 1234567.891 ==
en-US    1,234,567.89
de-DE    1.234.567,89
fr-FR    1^234^567,89
en-IN    1,234,567.89
de-CH    1’234’567.89
und      1,234,567.89

== the bug: changing the default locale changes %.2f ==
default (en_US)   : 1234.50
default (de_DE)   : 1234,50
explicit ROOT     : 1234.50

== not localized: hex, NaN, Infinity ==
ff NaN Infinity