Set or get options for which "special" functions get stepped into, when in step-mode.
When the debug package is in step-mode, there are a few special system functions that it can either step into, or leave the system to handle en bloc. These functions all have expression-type arguments. Currently, they are:
evalq, and (for built-in methods only)
within. The step-into behaviour is controlled by calling
step.into.sysfuns, which operates like
par. You can also circumvent step-into at particular lines, by using
go(n) to zoom through to the next statement. Additional methods for
within can be handled via e.g.
mtrace( with.myS3class), so are not considered "special" here.
# USAGE is not useful here-- see *Arguments* step.into.sysfuns( ...)
tag-value pairs of logicals, e.g.
Either the previous value(s) of tags that are set, or the entire logical vector of tags.
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