the first page of the textbook I have gives the imperative "cōnsīde" for "sit down". But the 555 verbs book lists the verb in the I form as consīdō and says it is declined the same as resīdō, which is verb 433 in the book, where the imperative is resīde, so the corresponding form must be consīde. where there isnt a macron on the o.
Is either book or both wrong or are there 2 versions of the same verb, or maybe different verbs in different eras?