Portuguese plural formula should be n != 1

[mihael-lovrencic-niceshops]

How This Applies to Portuguese Grammar
In formal Portuguese grammar, just like in English, any quantity other than exactly one requires the plural form. Crucially, the number zero is treated as a plural.

Here is how it looks in practice (using the word dia / day):

0: 0 dias (Plural)

1: 1 dia (Singular)

2: 2 dias (Plural)

10: 10 dias (Plural)

Because 0 requires the plural form, the system must trigger the plural translation when n = 0. The formula n != 1 successfully does this, because 0 is not equal to 1.

[nijel]

CLDR claims something different: https://www.unicode.org/cldr/charts/48/supplemental/language_plural_rules.html#pt