Turn on the HDF5 shuffle filter to improve array compression.

This follows the lead of alabaster.base's HDF5 saving, which in turn follows the behavior of rhdf5's h5createDataset().
ArtifactDB · Sep 22, 2024 · 5d826ee · 5d826ee
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diff --git a/DESCRIPTION b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: alabaster.matrix
 Title: Load and Save Artifacts from File
-Version: 1.5.9
-Date: 2024-09-12
+Version: 1.5.10
+Date: 2024-09-22
 Authors@R: person("Aaron", "Lun", role=c("aut", "cre"), email="[email protected]")
 License: MIT + file LICENSE
 Description: 

diff --git a/R/saveArray.R b/R/saveArray.R
@@ -99,6 +99,7 @@ h5_write_array <- function(handle, name, x, type, placeholder, extract.native=NU
     H5Pset_obj_track_times(phandle, FALSE)
 
     if (!is.null(compress) && compress > 0 && length(x)) {
+        H5Pset_shuffle(phandle) # improve compression by interlacing data elements.
         H5Pset_deflate(phandle, level=compress)
         if (is.null(chunks)) {
             chunks <- getHDF5DumpChunkDim(dim(x))