The purpose is to avoid creation of lists that contain negative rates or in accidental confusion with list of fluxes. Instances are usually automatically created from data
ConstantOutFluxRateList_by_PoolIndex
in their signature:by_PoolName,ConstantOutFluxRateList_by_PoolIndex-method
ConstLinDecompOp,missing,ConstantInternalFluxRateList_by_PoolIndex,ConstantOutFluxRateList_by_PoolIndex,numeric,missing-method
ConstLinDecompOp,missing,missing,ConstantOutFluxRateList_by_PoolIndex,numeric,missing-method