Calling a vim9script function with a range

Hi,

In "Comment()", how can i tell if the mapping "\c" was called with a visual 
range or not ?

I want to call "Comment()" only once, without resorting to a legacy function, 
and without resorting to an intermediate ex command.

I want access to the first and last visual lines, or else the current line (for 
non-visual, first==last).

---------------------------------
vim9script

def g:Comment()
   echo "a"
enddef

map \c :<C-U>call Comment()<CR>
---------------------------------

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