Supplying a seed makes a simulation or bootstrap reproducible and
restores the caller's random-number stream on exit. Bootstrap methods
that assign seeds to individual replicates also restore those local streams.
Details
These operations do not support R's Box–Muller normal generator: its
cached normal value is not part of .Random.seed, so restoring that
vector would change subsequent draws. They refuse before changing the
stream. Direct simulate_* calls with seed = NULL can still
use Box–Muller. sim_replicate assigns replicate seeds even
when its own seed is NULL.
The default Inversion generator is supported. To select it explicitly,
use RNGkind(normal.kind = "Inversion") before setting the seed
for the analysis. Changing the generator starts a different normal stream;
it does not recover a previous Box–Muller stream.