Extracted from .onLoad() to allow direct unit testing. Sets
package-level defaults for the retry behaviour shared by every
read_*() and collect_tern_data() call:
nert.max_tries— integer, default3Lnert.initial_delay— integer (seconds), default1L
Value
NULL, invisibly. Called for its side effect on
base::options().
Details
Existing user-set values (e.g. set in .Rprofile or via
base::options() before library(nert)) are preserved; only
unset options are populated with defaults.