determines (or estimates) the expiration from an xts object by either
finding the last row that is not
NA or by passing the name/symbol
of the xts object to
1 2 3
either “data” or “instrument”.
src is “data”, the returned value will be the
index of the last price that is not
NA (price is determined by
prefer can be passed through dots.)
src is “instrument” the symbol of the xts object will
be passed to
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