add nan possibility to exacttype
add nan possibility to exacttype

davidkunio/dedupe,datamade/dedupe,dedupeio/dedupe,pombredanne/dedupe,tfmorris/dedupe,nmiranda/dedupe,pombredanne/dedupe,neozhangthe1/dedupe,dedupeio/dedupe,nmiranda/dedupe,01-/dedupe,davidkunio/dedupe,neozhangthe1/dedupe,tfmorris/dedupe,datamade/dedupe,01-/dedupe