caching incompatibility

[nhejazi]

It's possible that the serialization mechanism used by Rmarkdown (in the cache=TRUE option of chunks) is incompatible with the manner in which the tmle3 wrapper function operates. This remains to be verified but could be a potential point of incompatibility with Rmarkdown. An MRE will be provided at a later date.

[jeremyrcoyle]

@nhejazi is there an MRE for this or should we close?

[nhejazi]

The Rmarkdown document derived from the tmle3 vignette appears to fail when trying to knit. This may be due to caching being enable, though I haven't explicitly checked this. Since the vignette presumably works just fine, the error produced here ought to be due to the caching mechanism.

issue32.zip