re: Let he who has never typoed, cast the first stone.
The verse in the Gospels to which you refer is frequently misquoted. The translation reads "Let he who is without sin be the first to cast a stone". That grammatical distinction has escaped many people who look down on the grammar of others. Which one is the first stone? Are they numbered?
Your typo is consistent throughout this thread. Therefore, it's a spelling error. Spelling counts, too, in the argument for structural uniformity in language.