I'm getting an error from csaw::windowCounts when I use a readParam object in the params argument This does not change when I explicitly load the library(GenomeInfoDb) which exports seqinfo. Is this a bug or am I missing something?

This is the code producing the error:

blacklist <- rtracklayer::import.bed(
    "https://github.com/Boyle-Lab/Blacklist/raw/master/lists/ce11-blacklist.v2.bed.gz"
)
rpar <- csaw::readParam(
    minq = 20, discard = blacklist, restrict = c(as.character(as.roman(1:6)), "X")
)

# reproducible example Bam file
library(chipseqDBData)
h3k27me3data <- H3K27me3Data()
bam <- h3k27me3data$Path[1]
# bam <- "out/alignments/ABC_123_sorted.bam" # my local bam

csaw::windowCounts(bam, param = rpar)

Error in (function (classes, fdef, mtable)  : 
  unable to find an inherited method for function ‘seqinfo’ for signature ‘"NULL"’

just calling seqinfo on blacklist works fine:

seqinfo(blacklist)

Seqinfo object with 6 sequences from an unspecified genome; no seqlengths:
  seqnames seqlengths isCircular genome
  chrIII           NA         NA   <NA>
  chrII            NA         NA   <NA>
  chrI             NA         NA   <NA>
  chrIV            NA         NA   <NA>
  chrV             NA         NA   <NA>
  chrX             NA         NA   <NA>

sessionInfo:

R version 3.6.3 (2020-02-29)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 18.04.5 LTS

Matrix products: default
BLAS:   /usr/lib/x86_64-linux-gnu/openblas/libblas.so.3
LAPACK: /usr/lib/x86_64-linux-gnu/libopenblasp-r0.2.20.so

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

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

other attached packages:
[1] testthat_2.3.2 devtools_2.3.1 usethis_1.6.1  reprex_0.3.0  

loaded via a namespace (and not attached):
 [1] Biobase_2.46.0              httr_1.4.2                  edgeR_3.28.1                pkgload_1.1.0              
 [5] bit64_4.0.2                 assertthat_0.2.1            askpass_1.1                 stats4_3.6.3               
 [9] BiocFileCache_1.10.2        blob_1.2.1                  GenomeInfoDbData_1.2.2      Rsamtools_2.2.3            
[13] remotes_2.2.0               progress_1.2.2              sessioninfo_1.1.1           pillar_1.4.6               
[17] RSQLite_2.2.0               backports_1.1.9             lattice_0.20-38             limma_3.42.2               
[21] glue_1.4.2                  digest_0.6.25               GenomicRanges_1.38.0        XVector_0.26.0             
[25] Matrix_1.2-18               XML_3.99-0                  pkgconfig_2.0.3             csaw_1.20.0                
[29] biomaRt_2.42.1              zlibbioc_1.32.0             purrr_0.3.4                 processx_3.4.3             
[33] BiocParallel_1.20.1         tibble_3.0.3                openssl_1.4.2               generics_0.0.2             
[37] IRanges_2.20.2              ellipsis_0.3.1              withr_2.2.0                 SummarizedExperiment_1.16.1
[41] GenomicFeatures_1.38.2      BiocGenerics_0.32.0         cli_2.0.2                   magrittr_1.5               
[45] crayon_1.3.4                memoise_1.1.0               ps_1.3.4                    fs_1.5.0                   
[49] fansi_0.4.1                 pkgbuild_1.1.0              tools_3.6.3                 prettyunits_1.1.1          
[53] hms_0.5.3                   lifecycle_0.2.0             matrixStats_0.56.0          stringr_1.4.0              
[57] S4Vectors_0.24.4            locfit_1.5-9.4              DelayedArray_0.12.3         AnnotationDbi_1.48.0       
[61] callr_3.4.3                 Biostrings_2.54.0           compiler_3.6.3              GenomeInfoDb_1.22.1        
[65] rlang_0.4.7                 grid_3.6.3                  RCurl_1.98-1.2              rstudioapi_0.11            
[69] rappdirs_0.3.1              bitops_1.0-6                curl_4.3                    DBI_1.1.0                  
[73] R6_2.4.1                    GenomicAlignments_1.22.1    dplyr_1.0.2                 rtracklayer_1.46.0         
[77] bit_4.0.4                   rprojroot_1.3-2             desc_1.2.0                  stringi_1.4.6              
[81] parallel_3.6.3              Rcpp_1.0.5                  vctrs_0.3.3                 tidyselect_1.1.0           
[85] dbplyr_1.4.4

The problem is that restrict= is set to roman numbers (presumably for Drosophila?) but obviously the data itself is for mouse, which makes the function very confused. Arguably the failure could be more graceful, but regardless, the function won't be doing anything sensible with these settings.