Are there implementations of rank-revealing QR/SVD decompositions, resp. QR and SVD updating / downdating mechanisms in any Julia package?
See for instance:
 Li and Zheng, A Rank-revealing Method with Updating, Downdating and Applications, SIAM J. Matrix Anal. Appl., 2005.
 RankRev: a Matlab package for computing the numerical rank and updating/downdating, T.-L. Lin, 2016.