$sheet.set() gets confused when the value argument is a RatStr:
Ambiguous call to 'set(Spreadsheet::XLSX::Worksheet: Int, Int, RatStr, :number-format(Str))'; these signatures all match:
(Spreadsheet::XLSX::Worksheet: Int $row, Int $col, Str $value, *%styles)
(Spreadsheet::XLSX::Worksheet: Int $row, Int $col, Real $value, *%styles)
$sheet.set()
gets confused when the value argument is aRatStr
: