Consider avoiding overwrite of package function environment

[MichaelChirico]

mediation/R/mediate.R

Line 1528 in a9a5c7b

environment(med.fun) <- environment()

This looks nice & convenient for not worrying about which objects inside mediate() can be referred by med.fun(), but has the negative side-effect that it's not possible to attach a debugger to med.fun():

debugonce(mediation:::med.fun)
mediate(...) # won't debug med.fun!

The workaround would be to add the debug() call inside mediate(), after the environment<- step, which requires re-building the package.