bug#64520: Cursor type, fill-column, and ruler numbering

[uzibalqa]

I have set fill-column to 72.

When I write in the buffer, I get a change in the background colour
upon reaching 72 when looking at the ruler.  There is a shift of 1
in the ruler because the ruler starts at 0.

But when using a block cursor, it looks like one is at column 0, rather
than column 1.  Could the ruler have the ability to be changed so that 
it starts at 1 ?  Because one can use either a line or a block for the 
cursor, there can be a different interpretation about column numbers.