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In user signup context, we are okay with there being an existing mirror dummy user with the matching email - at the end of the signup, that mirror dummy account will be activated and control of it given to the user doing this signup. However, in email change contexts (SCIM API and regular email change flow), we can't change an account's email address to the address that already belongs to an existing mirror dummy user. To avoid subtle bugs like this, we make callers have to explicitly specify whether existance of mirror dummies with the matching email address is okay or not.