Logic behind "sage" in URL field and EMAIL_ID - Wakaba and Kareha support board

Logic behind "sage" in URL field and EMAIL_ID (19)

4 Name: !WAHa.06x36 2005-09-26 07:12 ID:dGxkBh9f [Del]

"sage" being negative is only ever the case on image boards, and they hardly ever have IDs enabled.

Kareha has the option to use no IDs, to use ID when the email field is empty, or always use ID. It's been suggested to change the no-ID-on-email to no-ID-on-sage, which might or might not make a bit more sense.

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