This function moves variable-level attributes to the data.frame level
import attempts to standardize the return value from the various import functions to the extent possible, thus providing a uniform data structure regardless of what import package or function is used. It achieves this by storing any optional variable-related attributes at the variable level (i.e., an attribute for
mtcars$mpg is stored in
attributes(mtcars$mpg) rather than
gather_attrs moves these to the data.frame-level (i.e., in
x, with variable-level attributes stored at the data.frame level.
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