arm64 rounding problem

[Polkas]

linked to https://github.com/tidyverse/ggplot2/issues/5110

I found out in the ggplot2 test a problem with rounding for the arm64 machine for the vdiffr test (vdiffr::expect_doppelganger). One of the coordinates is not properly rounded x="0.000000000000064" instead of x='0.00'. As the function vdiffr:::write_svg is based on the C code, it is not surprising to me.

Minimal example the ggplot2 test.

library(ggplot2)
df <- data.frame(x = 1:3, y = 1:3, z = c("a", "b", "a"), a = 1)
plot <- ggplot(df, aes(x, y, colour = z)) +
  geom_point() +
  facet_wrap(~ a) +
  theme_bw(base_size = 33)

High level:

capt <- capture.output(
  vdiffr::expect_doppelganger("theme_bw_large", plot),
  type = "message"
)
readLines(trimws(capt[4]))[21]
# <rect x='0.000000000000064' y='0.00' width='720.00' height='576.00' style='stroke-width: 3.20; stroke: #FFFFFF; fill: #FFFFFF;' />

Low level.

temp_svg <- tempfile(fileext = ".svg")
# use vdiffr:::svglite_ which  use the C _vdiffr_svglite_
vdiffr:::write_svg(plot, temp_svg)
readLines(temp_svg)[21]
# <rect x='0.000000000000064' y='0.00' width='720.00' height='576.00' style='stroke-width: 3.20; stroke: #FFFFFF; fill: #FFFFFF;' />

sessioninfo::session_info()
#> ─ Session info ───────────────────────────────────────────────────────────────
#>  setting  value
#>  version  R version 4.2.2 (2022-10-31)
#>  os       macOS Ventura 13.0
#>  system   aarch64, darwin20
#>  ui       X11
#>  language (EN)
#>  collate  en_US.UTF-8
#>  ctype    en_US.UTF-8
#>  tz       Europe/Warsaw
#>  date     2022-12-18
#>  pandoc   2.18 @ /Applications/RStudio.app/Contents/MacOS/quarto/bin/tools/ (via rmarkdown)
#> 
#> ─ Packages ───────────────────────────────────────────────────────────────────
#>  package     * version    date (UTC) lib source
#>  cli           3.4.1      2022-09-23 [1] CRAN (R 4.2.0)
#>  digest        0.6.30     2022-10-18 [1] CRAN (R 4.2.0)
#>  evaluate      0.18       2022-11-07 [1] CRAN (R 4.2.2)
#>  fastmap       1.1.0      2021-01-25 [1] CRAN (R 4.2.0)
#>  fs            1.5.2      2021-12-08 [1] CRAN (R 4.2.0)
#>  glue          1.6.2      2022-02-24 [1] CRAN (R 4.2.0)
#>  highr         0.9        2021-04-16 [1] CRAN (R 4.2.0)
#>  htmltools     0.5.3.9002 2022-11-23 [1] Github (rstudio/htmltools@39b3f1f)
#>  knitr         1.40       2022-08-24 [1] CRAN (R 4.2.0)
#>  lifecycle     1.0.3      2022-10-07 [1] CRAN (R 4.2.0)
#>  magrittr      2.0.3      2022-03-30 [1] CRAN (R 4.2.0)
#>  purrr         0.3.5      2022-10-06 [1] CRAN (R 4.2.0)
#>  R.cache       0.16.0     2022-07-21 [1] CRAN (R 4.2.0)
#>  R.methodsS3   1.8.2      2022-06-13 [1] CRAN (R 4.2.0)
#>  R.oo          1.25.0     2022-06-12 [1] CRAN (R 4.2.0)
#>  R.utils       2.12.1     2022-10-30 [1] CRAN (R 4.2.0)
#>  reprex        2.0.2      2022-08-17 [1] CRAN (R 4.2.0)
#>  rlang         1.0.6      2022-09-24 [1] CRAN (R 4.2.0)
#>  rmarkdown     2.17       2022-10-07 [1] CRAN (R 4.2.0)
#>  rstudioapi    0.14       2022-08-22 [1] CRAN (R 4.2.0)
#>  sessioninfo   1.2.2      2021-12-06 [1] CRAN (R 4.2.0)
#>  stringi       1.7.8      2022-07-11 [1] CRAN (R 4.2.0)
#>  stringr       1.4.1      2022-08-20 [1] CRAN (R 4.2.0)
#>  styler        1.8.1      2022-11-07 [1] CRAN (R 4.2.2)
#>  withr         2.5.0      2022-03-03 [1] CRAN (R 4.2.0)
#>  xfun          0.34       2022-10-18 [1] CRAN (R 4.2.0)
#>  yaml          2.3.6      2022-10-18 [1] CRAN (R 4.2.0)
#> 
#>  [1] /Library/Frameworks/R.framework/Versions/4.2-arm64/Resources/library
#> 
#> ──────────────────────────────────────────────────────────────────────────────

^{Created on 2022-12-18 with reprex v2.0.2}