3way_comparison : <=> cmp
dereferencing : ${} @{} %{} &{} *{}
str_comparison : lt le gt ge eq ne
with_assign : + - * / % ** << >> x .
binary : & | ^
iterators : <>
unary : neg ! ~
special : nomethod fallback =
num_comparison : < <= >  >= == !=
assign : += -= *= /= %= **= <<= >>= x= .=
mutators : ++ --
func : atan2 cos sin exp abs log sqrt int
conversion : bool "" 0+