failFunctionoption so you can not fail on broken folder functions.
optOrEnvVarfirst looks up a name's value first as a option, then as an environment variable if the option value is unset or empty (string or vector).
setffinvocation can take several forms, and more extensive variable search can be performed; name for accessor function can be interpreted as name to lookup exactly, as uppercase, or as lowercase according to
setffis now called
This is the initial package release.
setfffunction establishes a variable accessor function.
listfffunction lists available variable accessor functions.
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