Possible redundant line?

[tangjm]

What's the reasoning behind this line

go-board/src/GoBoard.js

Line 55 in 927573a

sign = sign > 0 ? 1 : -1

?

Is it to allow for flexibility in letting us use any positive integer to represent Black and any negative integer to represent White?
I think this would, however, never see its use if we made use of the type file.

[yishn]

I didn't want to throw an error for invalid values of sign.