span w/ ids/nms/ranks: handle >1 input for statements with operators

ropensci / taxa

taxonomic classes for R

https://docs.ropensci.org/taxa

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Closed sckott closed 7 years ago

sckott commented 7 years ago

e..g, this now fails

span(ex_hierarchy1, ranks("> genus", "< family"))
#> Error in switch(op, `>` = { : EXPR must be a length 1 vector