Determine key binding used to call a mapping

Is there a way to obtain the mapping used to call a function from within that function (like with "v:operator")?

E.g. to reduce this

map vax :call SFunc(0)
map vix :call SFunc(1)

function SFunc(inner)
if a:inner
...
endif
endfunction

to something like this:

function SFunc()
if <???> == "i" (or "ix")
...
endif
endfunction

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