Hi, is the following a non-documented feature or a bug:
$ R --quiet --vanilla
opts <- base::.Options
opts[["abc"]]
#> NULL
options(abc = 42)
opts[["abc"]]
#> [1] 42
I would have expected that 'opts' would be a *copy* of base::.Options
that is not affected by later changes to base::.Options. FWIW, the
same happens if we try with:
opts <- .BaseNamespaceEnv[[".Options"]]
I don't think lazy evaluation is involved, because I evaluate
opts[["abc"]] above.
The only thing help(".Options") says is:
Note:
For compatibility with S there is a visible object .Options whose
value is a pairlist containing the current options() (in no particular
order). Assigning to it will make a local copy and not change the
original. (Using it however is faster than calling options()).
This behavior goes back to at least R 2.15.0.
/Henrik