In the other words, C standard library is not really small. It consists of a small mechanized portion and a much larger portion embedded in wetware, i.e. human

In the other words, C standard library is not really small. It consists of a small mechanized portion and a much larger portion embedded in wetware, i.e. human mind. The second portion is very hard to update or fix, so the first portion keeps growing to cover all faults of the second.