Central to this discussion is a common and widespread misconception: the wrong idea that electric current is a flow of electrons, and that flows of positive charge are impossible.
Nope and nope.
Only in metals is an electric current a flow of electrons. Protons can flow, and so can ions of both polarities. The type of charge-carrier depends on the type of conductor: metals, electrolytes, ionized gases. So, Franklin may have been "backwards" about way metals conduct a charge flow. But he wasn't wrong about proton conductors and PEMs used in solid-electrolyte fuel cells. Franklin was also wrong about battery acid and neon signs, where the moving charges have opposite polarities and flow in opposite directions. In Franklin's terms, electrolytes contain two (or more) kinds of 'electric fluid,' not just one.
In fact, when you get shocked by a HV power supply, no electrons flow through your body. The voltage impressed across your flesh produces a flow of the ions commonly found in your tissues: positive sodium and potassium ions, and negative chlorides, each polarity of ions flowing in opposite directions. How then can we describe the amperes which are electrocuting you?! Easy. Just use Conventional Current. That's what it's for. (Hint: ammeters measure conventional current. They do not report the percentages of positives and negatives drifting in opposite direction within the circuit.)
It's really quite amazing how many authors seem to believe Franklin's discredited one-fluid theory of electricity, or believe that electric currents are somehow "made out of electrons."
Metals - yes, electrons
Semiconductors - electrons in two energy bands (lower band is vacancies or 'holes')
Plasma - electrons, positive ions, negative ions (if Hydrogen plasma, then H+ bare protons are part of the current.)
Distilled water - protons (H+ ions) and OH- ions, no electrons
Battery acid - protons (H+ ions) and SO4- ions, no electrons
Oceans - Na+ ions, Cl- ions, some H+ and OH-, no electrons
Human flesh - Na+ ions, K+ ions, Cl- ions, many misc ions, no electrons
I suspect that WW-2 military training manuals are partly to blame for this situation. For instruction of technicians, their authors concentrated on metal wires and vacuum tubes, and based their concepts on the over-simplified (wrong) idea that "electricity equals electrons," and that all positive charges were really just a case of missing electrons.