logical: should the source formatting be retained when
echoing expressions, if possible?
...
passed to source
Value
A list containing all the data defined in the dump file with
keys corresponding to variable names.
Details
The R dump file can be read directly by R function source, which
by default would read the data into the user's workspace (the global environment).
This function instead read the data to a list, making it convenient to
prepare data for the stan model-fitting function.