Buffer class
A Buffer is an object containing a pointer to a piece of contiguous memory with a particular size.
buffer(x)
| x | R object. Only raw, numeric and integer vectors are currently supported | 
an instance of Buffer that borrows memory from x
buffer() lets you create an arrow::Buffer from an R object
$is_mutable() :
$ZeroPadding() :
$size() :
$capacity():
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