Opening a wormhole enables time travel to a specific point in time. By
default, the history data frame is exposed to the global
environment as it was available on that day.
| 1 2 3 4 5 6 7 | 
| history | a data frame with the publication history of the data.
Must have column names  | 
| date | 
 | 
| envir | environment where to expose the data. | 
| verbose | logical, what objects will be exposed? | 
| post_process | a function that is applied on  | 
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