simplify the code (calls to both const and non-const versions of get<double>() convert int64 values to double)
simplify the code (calls to both const and non-const versions of get<double>() convert int64 values to double)

karya0/picojson,Banchi0123/picojson,turenar/picojson,Banchi0123/picojson,turenar/picojson,pfultz2/picojson,pfultz2/picojson,kazuho/picojson,karya0/picojson,kazuho/picojson