Serializing calculations

I'm working on upgrading R version, and need to isolate the root cause for many differences (numeric and other).
I vaguely remember I once came across a package that that "serializes a calculation" - including a text representation of all arguments - to a file that is a valid R script, ready for execution (even in a different R build) . I can't for the life of me find it now. Does anyone know of such functionality?

Other ideas on how to achieve this would be very welcome.

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