If M and/or N are direct sum modules (isDirectSum M == true) then T is the direct sum of the tensor products between the components. This SHOULD be built into M**N, but isn't as of M2, v. 1.7
The object tensorWithComponents is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/CompleteIntersectionResolutions.m2:2667:0.