[Rd] How to handle INT8 data

[Dirk Eddelbuettel]

Not sure how we got from int8 to int64 ... but for what it is worth, I
recently a) needed 64-bit integers to represent nanosecond timestamps (which
then became the still new-ish CRAN package 'nanotime') and b) found the
support in package bit64 for its bit64::integer64 to be easy too use and
performant -- plus c) the data.table package reads/writes these well.

Dirk

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