Entering edit mode

Dear List,
A quick question about using the glmnet package (which I know is not a
BioC package ... apologies):
Would the options "upper.limits" and "lower.limits" in glmnet be
equivalent to an additionally constrained optimization on the range of
the coefficients?
For instance, would setting upper.limits to 0 be equivalent to a non-
positive least squared linear regression (regularized)?
Any helps are greatly appreciated!
Many thanks,
Yue