To list all sl3 options, just run this function without any parameters
provided. To query only one value, pass the first parameter. To set that,
use the value parameter too.
sl3Options(o, value)Option name (string).
Value to assign (optional)
if (FALSE) {
sl3Options()
sl3Options("sl3.verbose")
sl3Options("sl3.temp.dir")
sl3Options("sl3.verbose", TRUE)
}
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