env_browse(env) is equivalent to evaluating browser() in
env. It persistently sets the environment for step-debugging.
Supply value = FALSE to disable browsing.
env_is_browsed() is a predicate that inspects whether an
environment is being browsed.
env_browse(env, value = TRUE)env_is_browsed(env)
env_browse() returns the previous value of
env_is_browsed() (a logical), invisibly.
An environment.
Whether to browse env.