If I have a noun of cardinality 1, I am taught that I use the singular form.
E.g. I have 1 Apple
If the value is still 1, but represented as 1.0, do I still use the singular form?
E.g. I have 1.0 Apple
It seems laymen would say I have 1.0 Apples; is this just a trick of the brain but not valid English, or is plural correct even though the value is still 1?