Should as() find an ANY method even for an 'unregistered' S3 class?

Michael Chirico
    on Wed, 18 Mar 2026 10:40:11 -0700 writes:

    > We have
    >      setAs("ANY", "integer64", function(from) as.integer64(from))

Sorry, but  who is "we"?
R does not know about "integer64" nor an as.integer64()

I'd expect knowledgable posters to R-devel  to use reproducible
examples, please !?

Martin

    > I expected that would work to default as(x, "integer64")
    > to use the S3 coercion, but not so for a different S3
    > class:

    > x = 1e10 class(x) = c("foo", "integer64") as(x,
    > "integer64") # Error in as(x, "integer64") : # internal
    > problem in as(): ?foo? is(object, "integer64") is TRUE,
    > but the metadata asserts that the 'is' relation is FALSE

....