What characters are valid in user profile first and last name?

There is inconsistent handling of "valid" characters in a user profile first and last name, depending on where the fields are edited. Using the "Create User with i18n" plugin smart service allows a name to include characters, such as comma and period. (e.g. "King, Jr.") This appears in the user profile from the People tab on designer, afterwards. However, if you edit any field on the user profile in designer and click "Update", a validation error states "King, Jr. contains an invalid character."

Also, the "Update User Profile" smart service throws an error when used to edit this user, stating: "[First name may only contain letters, numbers, whitespace, and the _ or - special characters][Last name may only contain letters, numbers, whitespace, and the _ or - special characters]".

Is this list of valid characters accurate? If so, why is it that Appian doesn't actually have any is...

OriginalPostID-258520