testlist <- list(c = c(1816279391L, 898245836L, -1398198862L, -1584663038L,  1132424396L, -525050899L, -757697881L, -1664129272L, 295724870L,  730534871L, 876644822L, -863971313L, -12264480L, -130626102L,  205549992L, 265859360L, 2014865059L, -1535542312L, -1174098298L,  -2071554684L, -898538302L, -1489924940L, 1912429696L, -720527282L,  638054858L, -2140364230L, 1901183221L, -682198622L, -941792146L,  267461248L, -293666364L, -1935600974L, -1476166615L, 1881105377L,  1881462343L, 2052122945L, 760131388L, 1070775597L, 1371468253L,  1594069000L, 118239607L, 731142299L, -1204886734L, 2127328172L,  438560857L, -173701306L, 1668817859L, 2092157827L, -1057162517L,  -1873639607L, -2140505089L, 921676625L), d = c(606775780L, 648269751L,  -178913163L, -1065650953L, 1780435068L, -1275952148L, 617646286L,  1105785957L, 312297785L, 1075376181L, 1878043183L, 1797203670L,  1047417585L, 1641471365L, -1503243289L, 1313295456L, -459957980L,  -1366730467L, 2030259429L, 578009953L, -519220670L, -483342454L,  -1776651804L, 1639859269L, 1407084801L, 1740775137L, -966015256L,  -561952321L, -1902378382L, -859177886L, -462600635L, 730499967L,  1760854224L, -1214271107L, 175597032L, -122706042L, 1269430295L,  1945401687L, 1656724621L, 1227295922L, 479036115L, 741560374L,  -1430970718L, 1690642607L, 1864484578L, 356465015L, -19593912L,  -49153511L, -1635980086L, -1355022247L, -249627818L, -467466925L,  1154233690L, 191811850L, 1138119232L, -397649530L, -934981257L,  -2125344653L, 1892403540L, -288446669L, -1696821850L, 1247719565L,  889376285L, 1311220502L, 1844743662L, 1180524982L, 673843734L,  -105821805L, -1915340329L, 904488042L, -349010119L, 1512722375L,  534558053L, 957815649L, 1092974650L, -691941789L, -1744356659L,  -241289252L, -776071637L, -395972089L, 1118268539L, -1098392320L,  -1403700606L, 369681838L, 270498561L, -1095574129L, 1895021145L,  1504469147L, 1405949458L, 1425216001L, 1212973919L, 1432948069L,  -2004261306L, 994301356L), x = c(1961243419L, -655000698L, 72856112L,  -1458421458L, -213417341L, -338561002L, -469854822L, -150085269L,  -216758581L, 151146765L, 1493384450L, 360591369L, -978088784L,  -2071672985L, -2091122310L, 1776477788L, -160684033L, 1853361607L,  2085276049L, -906323314L, -1390002383L, -1425631186L, 1654237388L,  2089691250L, -78613911L, -931188412L, -906307950L, -193977951L,  -1755262398L, 1718251720L, 68719744L, -1480723806L, 224660437L,  -482600275L, 938491691L, 1616956919L, -1063306970L, 178908942L,  -1031565719L, 1082133325L, -451533880L, 1396536714L, 766883213L,  360875478L, 582941740L, 1760246314L, 1875415983L, 1218379053L,  -1272908281L, 1567330698L, 541529910L, -912519957L, 1527257027L,  -195957405L, 427823714L, 504336338L, 797301388L, -244640239L,  -1305589892L, -900503771L, 1551886416L, -791301142L, 1438993523L,  -707049980L, 1629524306L, -1951964354L, -710165856L, -31341222L,  -1599165839L, -2091033639L, 598166776L, -2104296221L, -1299368642L,  899251210L, 1144433218L, 1466998264L, 507996577L, -1513850168L,  1808253165L, 1505546508L, 1241926271L, -1614378525L, -63691181L,  -1530704958L, 179594159L), y = c(-1470841528L, 440806166L, 2052155934L,  347463711L, 1782894306L, 575063751L, 2107098481L, 969977825L,  611068223L, -1286253267L, -1497412421L, 1965873887L, 1890107794L,  -293119636L, 505404759L, -275957485L, -110996820L, -1213670818L,  1730550236L, 1391705027L, -1686284918L, 78640675L, -825001283L,  1622397018L), z = c(935992531L, 1198611788L, 542339054L, 652848007L,  -1652760141L, -1612218262L, -928211762L, -257218776L, 1984166845L,  -1252521515L, -1418148655L, 1651464447L, -348540278L, 556987625L,  -560875569L, -874501326L, 586313943L, 1249488373L, -227424684L,  -534817844L, 1476744825L, 927687190L, -602217192L, -102970597L,  -834931944L, -1264579162L, 299105009L, -229786293L, 1377092746L,  1596432443L, 1099256634L, 1629377839L, 1497909006L, -397101831L,  665840410L, -56072881L, -1138108133L, 1350129297L, NA, -937325022L,  1775579218L, 702827344L, -1825150320L, -540024933L, -105334967L,  822991663L, -1213821312L, -954424783L, -237862118L, -1227986358L,  97901284L, -1531347043L, 1899423650L, 1153618427L, 1751087920L,  2065523052L, -270235994L, -1292832585L, -976577686L, -2095380492L,  1374590613L, -1335389927L, -972273343L, 715828505L, -1909211328L,  598735081L, 2039698428L, -1369772032L, 1233556985L, -316271949L,  861664349L, 94467731L, -734604040L, -439557793L, 1597266702L,  -1907618089L, -761015872L, -891063299L, 1063803460L, 164681950L,  111990508L, 2025278423L, -341383815L))
result <- do.call(imager:::checkcoords,testlist)
str(result)