Substitute for the variables named in the second argument the
corresponding objects, substituting into object. The argument
frame is a named list; if omitted, the environment of the
caller is used.
This function differs from the ordinary substitute in that it
treats its first argument in the standard S way, by evaluating it. In
contrast, substitute does not evaluate its first argument.
The goal is to replace this with an eval= argument to
substitute.
substituteDirect(object, frame, cleanFunction=TRUE)