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⸘Unicode 5.1 added the inverted interrobang ‽ ext4, application expectations and power management about behavioural differences between ext3 and ext4 [1], most notably due to ext4's increased window of opportunity for files to end up empty due to both a longer commit window and delayed allocation of blocks in order to obtain a more pleasing on-disk layout.— Planet GNOME
Usually, in North America, punctuation goes outside always, unless a contextual exclamation point, period, question mark, or interrobang.
Speckter called his invention the "interrobang," a neologism that combines "interrogation" with "bang" (printer-speak for the exclamation mark).

American Heritage Dictionary (1)
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