cone for a ComplexMap of nonzero degree

[mahrud]

There's a comment above cone(ComplexMap) saying:

M2/M2/Macaulay2/packages/Complexes/ChainComplexMap.m2

Lines 857 to 860 in b1b46da

	-- sign convention: Using Conrad (Grothendieck Duality) sign choice for cone, pg 8 of intro.
	-- NOTE: one could extend this to complex maps which commute, but have nonzero degree,
	-- IF this would be useful at all.
	cone ComplexMap := Complex => f -> (

@ggsmith @mikestillman I went back and forth between whether this is what I need or not, and I think it is actually what I need. In particular, taking cone of a map f of nonzero degree isn't the same as cone of map(target f, (source f)[-degree f], i -> f_(i-degree f)), is it?

[mahrud]

I'm not sure how to figure out the correct sign conventions that your package uses, but if you could give me a pointer about how to extend cone to support maps of nonzero degree that would be helpful.