Conversely, if you wish to create and edit epubs with no DOCTYPES (and no warnings about them being missing when opening), feel free to uncheck Mend on Open/Save in your Sigil Preferences.
There may be other instances (splitting, etc...) where you may need to tell Sigil not to fix the missing doctypes), though.
I don't recommend that, though. I recommend simply letting Sigil add the doctypes when it finds them missing.
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