seq: different output when comparing with GNU

Found with the seq fuzzer

$ ./target/debug/coreutils seq -80 18.333615880731813 8158 > a.txt
$ LANG=C /usr/bin/seq -80 18.333615880731813 8158 > b.txt
$  diff -u a.txt b.txt
--- a.txt       2023-12-31 16:35:42.919872401 +0100
+++ b.txt       2023-12-31 16:36:00.859817826 +0100
@@ -376,75 +376,75 @@
 6795.105955274429875
 6813.439571155161688
 6831.773187035893501
-6850.106802916625314
+6850.106802916625313
 6868.440418797357127
 6886.774034678088940
 6905.107650558820753
 6923.441266439552566
 6941.774882320284379
 6960.108498201016192
-6978.442114081748005
+6978.442114081748004
 6996.775729962479818
 7015.109345843211631
 7033.442961723943444
 7051.776577604675257
 7070.110193485407070
 7088.443809366138883
-7106.777425246870696
+7106.777425246870695
 7125.111041127602509
 7143.444657008334322
 7161.778272889066135
 7180.111888769797948
 7198.445504650529761
 7216.779120531261574
-7235.112736411993387
+7235.112736411993386
 7253.446352292725200
 7271.779968173457013
 7290.113584054188826
 7308.447199934920639
 7326.780815815652452
 7345.114431696384265
-7363.448047577116078
+7363.448047577116077
 7381.781663457847891
 7400.115279338579704
 7418.448895219311517
 7436.782511100043330
 7455.116126980775143
 7473.449742861506956
-7491.783358742238769
+7491.783358742238768
 7510.116974622970582
 7528.450590503702395
 7546.784206384434208
 7565.117822265166021
 7583.451438145897834
 7601.785054026629647
-7620.118669907361460
+7620.118669907361459
 7638.452285788093273
-7656.785901668825086
+7656.785901668825085
 7675.119517549556899
 7693.453133430288712
 7711.786749311020525
 7730.120365191752338
-7748.453981072484151
+7748.453981072484150
 7766.787596953215964
-7785.121212833947777
+7785.121212833947776
 7803.454828714679590
 7821.788444595411403
 7840.122060476143216
 7858.455676356875029
-7876.789292237606842
+7876.789292237606841
 7895.122908118338655
-7913.456523999070468
+7913.456523999070467
 7931.790139879802281
 7950.123755760534094
 7968.457371641265907
 7986.790987521997720
-8005.124603402729533
+8005.124603402729532
 8023.458219283461346
-8041.791835164193159
+8041.791835164193158
 8060.125451044924972
 8078.459066925656785
 8096.792682806388598
 8115.126298687120411
-8133.459914567852224
-8151.793530448584037
+8133.459914567852223
+8151.793530448584036

Probably the usual numerial computing issues

Start by running the reported seq commands under the stated LANG=C environment and comparing their output. Then inspect the seq implementation, focusing on numeric calculation and formatting; no source file or test is named in the issue. Done means the discrepancy is understood and covered by a regression test that verifies the intended GNU-compatible output.