[Rd] r-devel windows gcc10-UCRT machine questions

[Dirk Eddelbuettel]

I saw two (unchanged, long-existing) tests of main fail narrowly on this new
platform (relative to the tolerance argument set).

Attempting to change the tolerance if .Platform$OS.type == "windows" failed
(any idea why that test would evaluate to FALSE?).  Could it be that
capabilities("long.double") returns FALSE?

As always, it is a little challenging to keep our stacks in order without
access to the platforms added.  So with thanks in advance for any pointers.
And of course for working towards utf8 on windows.

Dirk

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