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document special characters that cannot be used with PE installer/upgrader/uninstaller
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This is a very conservative list of special characters that shouldn’t be used with the PE installer:
single quote (') double quote (") comma (,) ampersand (&) parens (()) :) backslash (\) pipes (|) double-dollar ($$)
Also, MySQL only accepts usernames that are less than 16 characters.
Release Engineering recommends a long string of alphanumeric as a Best Practice™
This should be documented somewhere.