On 16/04/2021 7:54 a.m., Hugh Parsonage wrote:
My 2c is that if a package has actually tested something like that
(say, the ordering of a list's elements), then it is 100% likely that
a script out there depends on that behaviour too.
I suspect this test is not intentional, and it really wouldn't make
sense for a package to depend on the order of named list components.
In other words, the
change is not inconsequential. R users are in debt to package
developers but I think it behoves us to take special care not to
underestimate the work involved when a package's behaviour changes.
There's a difference between internal implementation changes and
external behaviour changes. For example, there are clear warnings not
to use un-exported functions (via :::), and a package that did that
would not be accepted on CRAN.
What I'm asking for are suggestions for ways to hide internal layouts of
objects from users. That seems a lot harder.
Duncan Murdoch
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