Creates a new rstack from a given input. Coerces input to a
list first using
as.list, the element at
x[] becomes the top of the new rstack.
input to convert to a stack.
additional arguments to be passed to or from methods.
Runs in O(N) in the size of the input. Because data frames return a list of
columns when run through
as.rstack results in a stack of
columns, rather than a stack of rows.
a new rstack.
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