type_sum() gives a brief summary of object type. Objects that commonly
occur in a data frame should return a string with four or less characters.
For most inputs, the argument is forwarded to
obj_sum() also includes the size of the object if
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an object to summarise. Generally only methods of atomic vectors and variants have been implemented.
type_sum() is in the "questioning" stage, because
provides essentially the same functionality based on a robust framework.
The generic will remain available for a while.
Users and implementers are encouraged to consider
once it becomes stable.
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 "int "  "int [10 x 1]"  "date "  "dttm "  "fn"
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