[petsc-dev] No VecRestoreArrayRead_Nest()?

[Zhang, Junchao via petsc-dev]

I did not see VecRestoreArrayRead_Nest. On VecNest, VecRestoreArrayRead 
defaults to VecRestoreArray(x,a) , which copies a[] to x and is expensive.  Is 
it an oversight?

--Junchao Zhang