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I have very few expertise in typography, close to none, so please forgive me my possible abusage and misusage of terms.
When reading books that employ so called ‘old style figures’ I often find the 0 (zero) so contrast-less. Take for example the font Hoefler Text, of which Wikipedia has an image. This 0 seems so round, I don't think it's perfectly round, but at smaller sizes it almost appears so.
The 6 and 9 have much stronger contrast, also the lowercase o has much more contrast generally (in a serif font). Why doesn't the 0 look more like the o? I often tend to perceive the 0 as ‘the odd one out’ when reading for example dates like ‘1609’ in a book.
Are there historical reasons for this shape, or am I seeing things that aren't that common at all. :)