Take the following as truth: I might have been influenced by the preceding double is in tadashii .  But I find that tadachi ni is frequently written and printed in two words, ni meaning `in,' so that tadachi ni just might be equivalent to something like `in the immediate.
Then the following statement: "While not technically incorrect, it is not often done in a formal setting." is true, false, or inconclusive?
Answer: Inconclusive