[Rd] %in% very slow for Date class since R 4.3

[Enrico Schumann]

On Thu, 26 Jun 2025, Dirk Eddelbuettel writes:

> On 25 June 2025 at 07:11, Kurt Hornik wrote:
> | >>>>> hormutz screed writes:
> | 
> | Thanks.  Makes sense to me, needs some discussion in R Core ...
>
> Nice to see this in NEWS [1]:
>
>   CHANGES IN R-devel BUG FIXES
>   
>   ‘<Date> %in% set’ has become as fast again, as it was before R 4.3.0, via
>   new S3 method ‘mtfrm.Date’. 
>
> Dirk
>
> [1] https://developer.r-project.org/blosxom.cgi/R-devel via the RSS feed

As a remark -- not a complaint ;-) --, in R 4.5.1: 

  match("2025-01-01", as.Date("2025-01-01"))
  ## [1] 1

which is, in a way, consistent with

  "2025-01-01" == as.Date("2025-01-01")
  ## [1] TRUE


In R-devel (2025-06-26 r88362):

  match("2025-01-01", as.Date("2025-01-01"))
  ## [1] NA

  "2025-01-01" == as.Date("2025-01-01")
  ## [1] TRUE


-- 
Enrico Schumann
Lucerne, Switzerland
https://enricoschumann.net