These options will be used on objects of class 'xts'.
opts_xts(constructor = c("as.xts.matrix", "next"), ...)An object of class <constructive_options/constructive_options_xts>
Depending on constructor, we construct the object as follows:
"as.xts.matrix" (default): We build the object using xts::as.xts.matrix().
"as.xts.data.frame": We build the object using xts::as.xts.data.frame(),
this is probably the most readable option but couldn't be made the default
constructor because it requires the 'xts' package to be installed .
"xts": We build the object using xts::xts().
".xts": We build the object using xts::.xts().
"next": Use the constructor for the next supported class.