Dear Dr. Zheng & SeqArray maintainer,

I have a Bioconductor package called "GDSArray" that interfaces GDS file nodes 
as DelayedArray instances. In this new Bioc devel version of 3.11, this package 
failed all platforms. The debugging shows inconsistent dimensions calculated 
from different SeqArray / gdsfmt functions. Following is some reproducible code 
showing that the "annotation/info/AA" node has different dimension from "AC" 
and the overall "num.variant" calculated from "SeqSummary". It works fine in 
the Bioc 3.10 (dimension of AA is 1348).Thanks!

Best,
Qian


```{r}
library(SeqArray)
file <- seqExampleFileName("gds")
f <- seqOpen(file)
objdesp.gdsn(index.gdsn(f, "annotation/info/AA"))$dim
## [1] 1328
objdesp.gdsn(index.gdsn(f, "annotation/info/AC"))$dim
## [1] 1348
seqSummary(f, verbose=FALSE)$num.variant
## [1] 1348
seqClose(f)

!> sessionInfo()
 R Under development (unstable) (2020-01-07 r77631)
 Platform: x86_64-pc-linux-gnu (64-bit)
 Running under: Ubuntu 18.04.3 LTS

 Matrix products: default
 BLAS:   /home/qian/miniconda3/envs/r-devel/lib/R/lib/libRblas.so
 LAPACK: /home/qian/miniconda3/envs/r-devel/lib/R/lib/libRlapack.so

 locale:
  [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
  [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8
  [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8
  [7] LC_PAPER=en_US.UTF-8       LC_NAME=C
  [9] LC_ADDRESS=C               LC_TELEPHONE=C
 [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C

 attached base packages:
 [1] stats     graphics  grDevices utils     datasets  methods   base

 other attached packages:
 [1] SeqArray_1.27.8 gdsfmt_1.23.5

 loaded via a namespace (and not attached):
  [1] IRanges_2.21.2         Biostrings_2.55.4      crayon_1.3.4
  [4] bitops_1.0-6           GenomeInfoDb_1.23.1    stats4_4.0.0
  [7] zlibbioc_1.33.1        XVector_0.27.0         S4Vectors_0.25.11
 [10] tools_4.0.0            RCurl_1.95-4.12        parallel_4.0.0
 [13] compiler_4.0.0         BiocGenerics_0.33.0    GenomicRanges_1.39.1
 [16] GenomeInfoDbData_1.2.2
```





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