A binary operator.
See also:
https://haxe.org/manual/types-numeric-operators.html
OpAdd
+
OpMult
*
OpDiv
/
OpSub
-
OpAssign
=
OpEq
==
OpNotEq
!=
OpGt
>
OpGte
>=
OpLt
<
OpLte
<=
OpAnd
&
OpOr
OpXor
^
OpBoolAnd
&&
OpBoolOr
OpShl
<<
OpShr
>>
OpUShr
>>>
OpMod
%
OpAssignOp(op:Binop)
+=
-=
/=
*=
<<=
>>=
>>>=
OpInterval
...
OpArrow
=>
OpIn
in