last
Search for a particular value in the tuple, starting at the given one-based index and working backward.
Return
The first encountered index of the code point when scanning backward from the startIndex. If the value is not found, answer
Parameters
value
The value to search for in the receiver.
start
The position at which to start scanning backward.
end
The position at which to stop scanning; should be <= startIndex for a non-empty range.