[Rd] all.equal failure

[Therneau, Terry M., Ph.D.]

This arose in testing [.terms and has me confused.

data(esoph)   # use a standard data set

t0x <- terms(model.frame( ~ tobgp, data=esoph))
t1 <-  terms(model.frame(ncases ~ agegp + tobgp, data=esoph))
t1x <- (delete.response(t1))[-1]

 > all.equal(t0x, t1x)
[1] TRUE

# the above is wrong, because they actually are not the same

 > all.equal(attr(t0x, 'dataClasses'), attr(t1x, 'dataClasses'))
[1] "Names: 1 string mismatch"
[2] "Lengths (1, 2) differ (string compare on first 1)"

 > sessionInfo()
R Under development (unstable) (2019-04-05 r76323)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 18.04.2 LTS

Matrix products: default
BLAS:   /usr/local/src/R-devel/lib/libRblas.so
LAPACK: /usr/local/src/R-devel/lib/libRlapack.so

locale:
  [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
  [3] LC_TIME=en_US.UTF-8        LC_COLLATE=C
  [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

loaded via a namespace (and not attached):
[1] compiler_3.7.0 tools_3.7.0


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