first
Search for a particular value in the tuple, starting at the given index and working forward.
Return
The first encountered index of the code point when scanning forward from the startIndex. If the value is not found, answer 0.
Parameters
value
The value to search for in the receiver.
start
The position at which to start scanning.
end
The position at which to stop scanning, which should be >= the startIndex for a non-empty range.